diff --git a/config/core.php b/config/core.php
index 49d34f6..8fda506 100644
--- a/config/core.php
+++ b/config/core.php
@@ -65,4 +65,29 @@ return [
         'return_window_days' => 14,
     ],
 
+    /*
+    |--------------------------------------------------------------------------
+    | Storefront OTP Login
+    |--------------------------------------------------------------------------
+    |
+    | Modules\Core\Auth\Services\UserOtpService's passwordless login.
+    | max_attempts caps how many wrong codes a shopper can guess against ONE
+    | generated code before it's invalidated outright. generation_limit/
+    | generation_decay_minutes cap how often a NEW code can be requested for
+    | the same email — independent of max_attempts, since generating a fresh
+    | code also resets the guess count, so an attempt cap alone doesn't stop
+    | an attacker from just requesting a new code every few tries. This same
+    | limit is also what stands between a malicious/careless caller and
+    | mail-bombing one inbox.
+    |
+    */
+
+    'auth' => [
+        'otp' => [
+            'max_attempts' => 5,
+            'generation_limit' => 3,
+            'generation_decay_minutes' => 10,
+        ],
+    ],
+
 ];
diff --git a/database/migrations/2026_09_14_000001_add_otp_attempts_to_users_table.php b/database/migrations/2026_09_14_000001_add_otp_attempts_to_users_table.php
new file mode 100644
index 0000000..bf43b6c
--- /dev/null
+++ b/database/migrations/2026_09_14_000001_add_otp_attempts_to_users_table.php
@@ -0,0 +1,30 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+/**
+ * Caps brute-forcing a 6-digit OTP code (1M combinations, 10-minute
+ * window, previously uncapped) — see Modules\Core\Auth\Services\
+ * UserOtpService::validate(), which now invalidates the code entirely
+ * (forcing a fresh generateAndSend()) once otp_attempts reaches its max,
+ * rather than leaving a live code guessable indefinitely within its
+ * expiry window.
+ */
+return new class extends Migration
+{
+    public function up(): void
+    {
+        Schema::table('users', function (Blueprint $table) {
+            $table->unsignedTinyInteger('otp_attempts')->default(0)->after('otp_expires_at');
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::table('users', function (Blueprint $table) {
+            $table->dropColumn('otp_attempts');
+        });
+    }
+};
diff --git a/database/migrations/2026_09_15_000001_create_user_sessions_table.php b/database/migrations/2026_09_15_000001_create_user_sessions_table.php
new file mode 100644
index 0000000..dbfb6fa
--- /dev/null
+++ b/database/migrations/2026_09_15_000001_create_user_sessions_table.php
@@ -0,0 +1,41 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+/**
+ * A per-login session registry, independent of the actual session store
+ * driver (SESSION_DRIVER=redis in this app — no "sessions" table to
+ * purge by user_id the way the database driver would allow). Each
+ * successful OTP login (Modules\Core\Auth\Services\UserOtpService::
+ * validate()) records one row here and stamps the token into the
+ * Laravel session payload; Modules\Core\Auth\Http\Middleware\
+ * EnsureSessionNotRevoked checks it on every request. "Logout
+ * everywhere" (Modules\Core\Auth\Services\UserSessionService::
+ * revokeOtherSessions()) is then just marking every OTHER row
+ * revoked_at, no session-store-specific logic anywhere.
+ */
+return new class extends Migration
+{
+    public function up(): void
+    {
+        Schema::create('user_sessions', function (Blueprint $table) {
+            $table->id();
+            $table->foreignId('user_id')->constrained()->cascadeOnDelete();
+            $table->string('token', 64)->unique();
+            $table->string('user_agent')->nullable();
+            $table->string('ip_address', 45)->nullable();
+            $table->timestamp('last_used_at');
+            $table->timestamp('revoked_at')->nullable();
+            $table->timestamps();
+
+            $table->index(['user_id', 'revoked_at']);
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::dropIfExists('user_sessions');
+    }
+};
diff --git a/src/Auth/Events/CustomerLoggedIn.php b/src/Auth/Events/CustomerLoggedIn.php
new file mode 100644
index 0000000..5404c30
--- /dev/null
+++ b/src/Auth/Events/CustomerLoggedIn.php
@@ -0,0 +1,18 @@
+<?php
+
+namespace Modules\Core\Auth\Events;
+
+use Illuminate\Contracts\Auth\Authenticatable;
+
+/**
+ * Dispatched by Modules\Core\Auth\Services\UserOtpService::validate() on a
+ * successful OTP login — distinct from UserCreated (which only fires for
+ * a genuinely first-time email); this fires on every successful login,
+ * new user or returning one.
+ */
+class CustomerLoggedIn
+{
+    public function __construct(
+        public readonly Authenticatable $user,
+    ) {}
+}
diff --git a/src/Auth/Exceptions/OtpThrottledException.php b/src/Auth/Exceptions/OtpThrottledException.php
new file mode 100644
index 0000000..246b841
--- /dev/null
+++ b/src/Auth/Exceptions/OtpThrottledException.php
@@ -0,0 +1,20 @@
+<?php
+
+namespace Modules\Core\Auth\Exceptions;
+
+use RuntimeException;
+
+/**
+ * Thrown by Modules\Core\Auth\Services\UserOtpService::generateAndSend()
+ * when an email has requested too many codes too quickly — caps both
+ * mail-bombing one inbox and the "just request a fresh code to reset my
+ * guess count" loophole a per-code attempt cap alone doesn't close.
+ */
+class OtpThrottledException extends RuntimeException
+{
+    public function __construct(
+        public readonly int $availableInSeconds,
+    ) {
+        parent::__construct("Too many code requests. Try again in {$availableInSeconds} second(s).");
+    }
+}
diff --git a/src/Auth/Http/Middleware/EnsureSessionNotRevoked.php b/src/Auth/Http/Middleware/EnsureSessionNotRevoked.php
new file mode 100644
index 0000000..824262b
--- /dev/null
+++ b/src/Auth/Http/Middleware/EnsureSessionNotRevoked.php
@@ -0,0 +1,50 @@
+<?php
+
+namespace Modules\Core\Auth\Http\Middleware;
+
+use Closure;
+use Illuminate\Http\Request;
+use Illuminate\Support\Facades\Auth;
+use Modules\Core\Auth\Services\UserSessionService;
+use Symfony\Component\HttpFoundation\Response;
+
+/**
+ * The enforcement half of the session registry — see
+ * Modules\Core\Auth\Services\UserSessionService's own docblock. Not
+ * auto-registered anywhere (no routes/kernel wiring exist in this
+ * package — see Modules\Core\Customer\Services\CustomerAccountService's
+ * own docblock for why this branch stops at services); a consuming app
+ * adds this to its `web` middleware group (after `auth`) to actually get
+ * "logout everywhere" enforcement.
+ *
+ * A request with no recorded UserSession at all (see
+ * UserSessionService::currentSession()'s own docblock) is let through —
+ * only an EXPLICITLY revoked session is rejected.
+ */
+class EnsureSessionNotRevoked
+{
+    public function __construct(
+        private readonly UserSessionService $sessions,
+    ) {}
+
+    public function handle(Request $request, Closure $next): Response
+    {
+        if (! Auth::check()) {
+            return $next($request);
+        }
+
+        $session = $this->sessions->currentSession();
+
+        if ($session && $session->isRevoked()) {
+            Auth::logout();
+            $request->session()->invalidate();
+            $request->session()->regenerateToken();
+
+            abort(401, 'Your session has been revoked. Please log in again.');
+        }
+
+        $session?->update(['last_used_at' => now()]);
+
+        return $next($request);
+    }
+}
diff --git a/src/Auth/Models/UserSession.php b/src/Auth/Models/UserSession.php
new file mode 100644
index 0000000..219b7da
--- /dev/null
+++ b/src/Auth/Models/UserSession.php
@@ -0,0 +1,33 @@
+<?php
+
+namespace Modules\Core\Auth\Models;
+
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+
+/**
+ * One row per login (see Modules\Core\Auth\Services\UserOtpService::
+ * validate()) — see that table's own migration docblock for why this
+ * exists independent of the actual session-store driver.
+ */
+class UserSession extends Model
+{
+    protected $guarded = [];
+
+    protected $casts = [
+        'last_used_at' => 'datetime',
+        'revoked_at' => 'datetime',
+    ];
+
+    public function user(): BelongsTo
+    {
+        $model = config('auth.providers.users.model');
+
+        return $this->belongsTo($model);
+    }
+
+    public function isRevoked(): bool
+    {
+        return $this->revoked_at !== null;
+    }
+}
diff --git a/src/Auth/Services/UserOtpService.php b/src/Auth/Services/UserOtpService.php
index b5a2b1d..7bc15da 100644
--- a/src/Auth/Services/UserOtpService.php
+++ b/src/Auth/Services/UserOtpService.php
@@ -2,16 +2,75 @@
 
 namespace Modules\Core\Auth\Services;
 
+use Illuminate\Contracts\Auth\Authenticatable;
+use Illuminate\Http\Request;
+use Illuminate\Support\Facades\Auth;
+use Illuminate\Support\Facades\Event;
 use Illuminate\Support\Facades\Mail;
+use Illuminate\Support\Facades\RateLimiter;
+use Modules\Core\Auth\Events\CustomerLoggedIn;
+use Modules\Core\Auth\Exceptions\OtpThrottledException;
 use Modules\Core\Auth\Mail\UserOtpMail;
 
+/**
+ * The storefront's passwordless login — a shopper supplies only an email
+ * (Shopify-style), gets a 6-digit code, and validate() authenticates the
+ * `web` guard via Auth::login().
+ *
+ * That alone is enough to merge/associate any active guest cart into the
+ * now-known customer — Auth::login() fires Illuminate\Auth\Events\Login,
+ * which Lunar's own Lunar\Listeners\CartSessionAuthListener (registered
+ * unconditionally in LunarServiceProvider::boot(), no opt-in needed)
+ * already listens to, calling CartSession::associate() with
+ * config('lunar.cart.auth_policy') — 'merge' by default, 'override' if a
+ * consumer changes that config. Deliberately no cart-association call
+ * here: doing our own on top would run a SECOND merge attempt with a
+ * hardcoded policy that ignores whatever the consumer configured.
+ *
+ * generateAndSend()'s find-or-create already triggers the full
+ * Customer/User pairing cascade for a genuinely new email — see
+ * Modules\Core\Auth\Events\UserCreated's own docblock and
+ * Modules\Core\Customer\Listeners\CreateCustomerForUser.
+ *
+ * Two independent throttles, both configured under core.auth.otp — see
+ * config/core.php's own comment for why they're separate: max_attempts
+ * caps wrong guesses against ONE code; generation_limit caps how often a
+ * NEW code can be requested for the same email at all (closes both the
+ * "regenerate to reset my guess count" loophole and mail-bombing one
+ * inbox).
+ *
+ * validate() also records a UserSessionService entry for the new login —
+ * see that class's own docblock for the "logout everywhere" registry
+ * this feeds (Modules\Core\Auth\Http\Middleware\EnsureSessionNotRevoked
+ * is the enforcement half; a consuming app must add it to its own
+ * middleware stack). $request is optional purely so this service stays
+ * callable from a context with no HTTP request at all (a console
+ * command, a test) — user-agent/ip are simply not recorded when omitted.
+ */
 class UserOtpService
 {
     private const EXPIRY_MINUTES = 10;
     private const CODE_LENGTH = 6;
 
+    public function __construct(
+        private readonly UserSessionService $sessions,
+    ) {}
+
+    /**
+     * @throws OtpThrottledException if this email has requested too many
+     *   codes within core.auth.otp.generation_decay_minutes
+     */
     public function generateAndSend(string $email): bool
     {
+        $limiterKey = $this->generationLimiterKey($email);
+        $maxGenerations = (int) config('core.auth.otp.generation_limit', 3);
+
+        if (RateLimiter::tooManyAttempts($limiterKey, $maxGenerations)) {
+            throw new OtpThrottledException(RateLimiter::availableIn($limiterKey));
+        }
+
+        RateLimiter::hit($limiterKey, (int) config('core.auth.otp.generation_decay_minutes', 10) * 60);
+
         $model = config('auth.providers.users.model');
         $user = $model::firstOrCreate(['email' => $email]);
 
@@ -19,6 +78,7 @@ class UserOtpService
 
         $user->otp_code = $code;
         $user->otp_expires_at = now()->addMinutes(self::EXPIRY_MINUTES);
+        $user->otp_attempts = 0;
         $user->save();
 
         Mail::to($user->email)->send(new UserOtpMail($user->name ?? $user->email, $code));
@@ -26,23 +86,55 @@ class UserOtpService
         return true;
     }
 
-    public function validate(string $email, string $code)
+    /**
+     * A wrong code counts against core.auth.otp.max_attempts and, once
+     * reached, invalidates the code entirely — the shopper must request
+     * a fresh one via generateAndSend() (itself throttled independently
+     * — see this class's own docblock) rather than being able to keep
+     * guessing against a still-live code for the rest of its 10-minute
+     * expiry window.
+     */
+    public function validate(string $email, string $code, ?Request $request = null): ?Authenticatable
     {
         $model = config('auth.providers.users.model');
         $user = $model::where('email', $email)->first();
 
-        if (! $user) {
+        if (! $user || ! $user->otp_expires_at || now()->isAfter($user->otp_expires_at)) {
             return null;
         }
 
-        if (! $user->otp_expires_at || $user->otp_code != $code || now()->isAfter($user->otp_expires_at)) {
+        if ($user->otp_code != $code) {
+            $user->otp_attempts++;
+
+            if ($user->otp_attempts >= (int) config('core.auth.otp.max_attempts', 5)) {
+                $user->otp_code = null;
+                $user->otp_expires_at = null;
+                $user->otp_attempts = 0;
+            }
+
+            $user->save();
+
             return null;
         }
 
         $user->otp_code = null;
         $user->otp_expires_at = null;
+        $user->otp_attempts = 0;
         $user->save();
 
+        RateLimiter::clear($this->generationLimiterKey($email));
+
+        Auth::login($user);
+
+        $this->sessions->record($user, $request);
+
+        Event::dispatch(new CustomerLoggedIn($user));
+
         return $user;
     }
+
+    private function generationLimiterKey(string $email): string
+    {
+        return 'otp-generate:'.strtolower($email);
+    }
 }
diff --git a/src/Auth/Services/UserSessionService.php b/src/Auth/Services/UserSessionService.php
new file mode 100644
index 0000000..d1f36b1
--- /dev/null
+++ b/src/Auth/Services/UserSessionService.php
@@ -0,0 +1,105 @@
+<?php
+
+namespace Modules\Core\Auth\Services;
+
+use Illuminate\Contracts\Auth\Authenticatable;
+use Illuminate\Http\Request;
+use Illuminate\Support\Str;
+use Modules\Core\Auth\Models\UserSession;
+
+/**
+ * The record/revoke half of the session registry — see
+ * database/migrations/2026_09_15_000001_create_user_sessions_table.php's
+ * own docblock for why this exists (SESSION_DRIVER=redis in this app has
+ * no "sessions" table to purge by user_id). The enforcement half is
+ * Modules\Core\Auth\Http\Middleware\EnsureSessionNotRevoked, which reads
+ * the token this class stamps into the session payload.
+ */
+class UserSessionService
+{
+    private const SESSION_TOKEN_KEY = 'user_session_token';
+
+    /**
+     * Called once, right after Auth::login() succeeds (see
+     * UserOtpService::validate()) — generates a fresh token, records it,
+     * and stamps it into the CURRENT session payload so
+     * EnsureSessionNotRevoked can look it up on later requests.
+     */
+    public function record(Authenticatable $user, ?Request $request = null): UserSession
+    {
+        $token = Str::random(64);
+
+        $session = UserSession::create([
+            'user_id' => $user->getAuthIdentifier(),
+            'token' => $token,
+            'user_agent' => $request?->userAgent(),
+            'ip_address' => $request?->ip(),
+            'last_used_at' => now(),
+        ]);
+
+        session([self::SESSION_TOKEN_KEY => $token]);
+
+        return $session;
+    }
+
+    /**
+     * Revokes every OTHER active session for $user — the current one
+     * (matched by the token in the CURRENT session payload) is left
+     * alone, matching Laravel's own logoutOtherDevices() semantics
+     * (there just isn't a password to re-verify against here — this is a
+     * passwordless account, so revocation is simply "every row that
+     * isn't the one making this request").
+     *
+     * Known, deliberately accepted gap: this requires only a currently
+     * valid session, not a freshly-completed login — so anyone holding
+     * an already-authenticated session (e.g. someone who sits down at an
+     * account left logged in on a shared/public PC) can use this to
+     * evict the real owner's OTHER sessions just as easily as the real
+     * owner could use it to evict an intruder's. A stricter version would
+     * require a fresh OTP re-verification (e.g. within the last few
+     * minutes) before allowing this call. Left as-is for now — revisit if
+     * this turns out to matter in practice, rather than building
+     * abuse-resistance against a threat model nobody's confirmed is real
+     * for this storefront.
+     */
+    public function revokeOtherSessions(Authenticatable $user): int
+    {
+        $currentToken = session(self::SESSION_TOKEN_KEY);
+
+        return UserSession::query()
+            ->where('user_id', $user->getAuthIdentifier())
+            ->whereNull('revoked_at')
+            ->when($currentToken, fn ($query) => $query->where('token', '!=', $currentToken))
+            ->update(['revoked_at' => now()]);
+    }
+
+    /**
+     * Revokes EVERY session for $user, current one included — for a
+     * "this account may be compromised" response, not a routine logout.
+     */
+    public function revokeAllSessions(Authenticatable $user): int
+    {
+        return UserSession::query()
+            ->where('user_id', $user->getAuthIdentifier())
+            ->whereNull('revoked_at')
+            ->update(['revoked_at' => now()]);
+    }
+
+    /**
+     * @return UserSession|null null if the CURRENT session has no
+     *   recorded token at all (e.g. a session predating this feature, or
+     *   one Auth::login() established outside UserOtpService) — treated
+     *   as valid by EnsureSessionNotRevoked rather than rejected, since
+     *   there's nothing to have been revoked.
+     */
+    public function currentSession(): ?UserSession
+    {
+        $token = session(self::SESSION_TOKEN_KEY);
+
+        if (! $token) {
+            return null;
+        }
+
+        return UserSession::where('token', $token)->first();
+    }
+}
diff --git a/src/Customer/Events/CustomerAddressCreated.php b/src/Customer/Events/CustomerAddressCreated.php
new file mode 100644
index 0000000..2afacf3
--- /dev/null
+++ b/src/Customer/Events/CustomerAddressCreated.php
@@ -0,0 +1,22 @@
+<?php
+
+namespace Modules\Core\Customer\Events;
+
+use Illuminate\Contracts\Auth\Authenticatable;
+use Lunar\Models\Address;
+
+/**
+ * Dispatched by Modules\Core\Customer\Services\CustomerAccountService::
+ * createAddress(). $causer is carried explicitly (unlike e.g.
+ * Modules\Core\Payment\Events\PaymentMethodCreated, which is always
+ * staff-caused implicitly) because this write happens on the `web`
+ * guard, not `staff` — a listener logging this needs to know who to
+ * attribute it to without guessing a guard.
+ */
+class CustomerAddressCreated
+{
+    public function __construct(
+        public readonly Address $address,
+        public readonly Authenticatable $causer,
+    ) {}
+}
diff --git a/src/Customer/Events/CustomerAddressDeleted.php b/src/Customer/Events/CustomerAddressDeleted.php
new file mode 100644
index 0000000..e644686
--- /dev/null
+++ b/src/Customer/Events/CustomerAddressDeleted.php
@@ -0,0 +1,17 @@
+<?php
+
+namespace Modules\Core\Customer\Events;
+
+use Illuminate\Contracts\Auth\Authenticatable;
+
+class CustomerAddressDeleted
+{
+    /**
+     * @param  array<string, mixed>  $address  Snapshot of the deleted
+     *   row — already gone from the database by dispatch time.
+     */
+    public function __construct(
+        public readonly array $address,
+        public readonly Authenticatable $causer,
+    ) {}
+}
diff --git a/src/Customer/Events/CustomerAddressUpdated.php b/src/Customer/Events/CustomerAddressUpdated.php
new file mode 100644
index 0000000..bdb4701
--- /dev/null
+++ b/src/Customer/Events/CustomerAddressUpdated.php
@@ -0,0 +1,19 @@
+<?php
+
+namespace Modules\Core\Customer\Events;
+
+use Illuminate\Contracts\Auth\Authenticatable;
+use Lunar\Models\Address;
+
+class CustomerAddressUpdated
+{
+    /**
+     * @param  array<string, mixed>  $old  Snapshot of the changed
+     *   attributes before the update.
+     */
+    public function __construct(
+        public readonly Address $address,
+        public readonly array $old,
+        public readonly Authenticatable $causer,
+    ) {}
+}
diff --git a/src/Customer/Events/CustomerProfileUpdated.php b/src/Customer/Events/CustomerProfileUpdated.php
new file mode 100644
index 0000000..63f5bd7
--- /dev/null
+++ b/src/Customer/Events/CustomerProfileUpdated.php
@@ -0,0 +1,19 @@
+<?php
+
+namespace Modules\Core\Customer\Events;
+
+use Illuminate\Contracts\Auth\Authenticatable;
+use Modules\Core\Customer\Models\Customer;
+
+class CustomerProfileUpdated
+{
+    /**
+     * @param  array<string, mixed>  $old  Snapshot of the changed
+     *   attributes before the update.
+     */
+    public function __construct(
+        public readonly Customer $customer,
+        public readonly array $old,
+        public readonly Authenticatable $causer,
+    ) {}
+}
diff --git a/src/Customer/Exceptions/AddressNotFoundException.php b/src/Customer/Exceptions/AddressNotFoundException.php
new file mode 100644
index 0000000..c215141
--- /dev/null
+++ b/src/Customer/Exceptions/AddressNotFoundException.php
@@ -0,0 +1,20 @@
+<?php
+
+namespace Modules\Core\Customer\Exceptions;
+
+use RuntimeException;
+
+/**
+ * Thrown by Modules\Core\Customer\Services\CustomerAccountService when an
+ * address id doesn't belong to the customer making the request — never
+ * a plain 404/ModelNotFoundException, so a storefront can't probe for
+ * another customer's address ids by trying sequential ones and reading
+ * the response shape.
+ */
+class AddressNotFoundException extends RuntimeException
+{
+    public function __construct()
+    {
+        parent::__construct('Address not found.');
+    }
+}
diff --git a/src/Customer/Exceptions/OrderNotFoundException.php b/src/Customer/Exceptions/OrderNotFoundException.php
new file mode 100644
index 0000000..d637ac1
--- /dev/null
+++ b/src/Customer/Exceptions/OrderNotFoundException.php
@@ -0,0 +1,19 @@
+<?php
+
+namespace Modules\Core\Customer\Exceptions;
+
+use RuntimeException;
+
+/**
+ * Thrown by Modules\Core\Customer\Services\CustomerAccountService when an
+ * order id doesn't belong to the customer making the request (or isn't
+ * placed yet) — never a plain 404/ModelNotFoundException, so a
+ * storefront can't probe for another customer's order ids.
+ */
+class OrderNotFoundException extends RuntimeException
+{
+    public function __construct()
+    {
+        parent::__construct('Order not found.');
+    }
+}
diff --git a/src/Customer/Listeners/LogCustomerAccountActivity.php b/src/Customer/Listeners/LogCustomerAccountActivity.php
new file mode 100644
index 0000000..1a7e4d0
--- /dev/null
+++ b/src/Customer/Listeners/LogCustomerAccountActivity.php
@@ -0,0 +1,61 @@
+<?php
+
+namespace Modules\Core\Customer\Listeners;
+
+use Lunar\Models\Address;
+use Modules\Core\Customer\Events\CustomerAddressCreated;
+use Modules\Core\Customer\Events\CustomerAddressDeleted;
+use Modules\Core\Customer\Events\CustomerAddressUpdated;
+use Modules\Core\Customer\Events\CustomerProfileUpdated;
+use Modules\Core\Logging\ActivityLogService;
+
+/**
+ * Same pattern as Payment\Listeners\LogPaymentMethodActivity — routes
+ * Modules\Core\Customer\Services\CustomerAccountService's own events
+ * through the shared Logging\ActivityLogService, giving every
+ * shopper-initiated address/profile change an audit trail (previously
+ * none existed at all for account self-service writes). $causer is
+ * passed through explicitly on every call, since these events are
+ * `web`-guard-caused, not `staff`-guard — see ActivityLogService's own
+ * docblock for why that parameter exists.
+ */
+class LogCustomerAccountActivity
+{
+    public function __construct(
+        private readonly ActivityLogService $activityLog,
+    ) {}
+
+    public function handleAddressCreated(CustomerAddressCreated $event): void
+    {
+        $this->activityLog->created($event->address, $event->address->getAttributes(), $event->causer);
+    }
+
+    public function handleAddressUpdated(CustomerAddressUpdated $event): void
+    {
+        $this->activityLog->updated(
+            $event->address,
+            $event->old,
+            $event->address->only(array_keys($event->old)),
+            $event->causer,
+        );
+    }
+
+    public function handleAddressDeleted(CustomerAddressDeleted $event): void
+    {
+        $subject = (new Address)->forceFill($event->address);
+        $subject->exists = true;
+        $subject->id = $event->address['id'];
+
+        $this->activityLog->deleted($subject, $event->address, $event->causer);
+    }
+
+    public function handleProfileUpdated(CustomerProfileUpdated $event): void
+    {
+        $this->activityLog->updated(
+            $event->customer,
+            $event->old,
+            $event->customer->only(array_keys($event->old)),
+            $event->causer,
+        );
+    }
+}
diff --git a/src/Customer/Services/CustomerAccountService.php b/src/Customer/Services/CustomerAccountService.php
new file mode 100644
index 0000000..45d663c
--- /dev/null
+++ b/src/Customer/Services/CustomerAccountService.php
@@ -0,0 +1,255 @@
+<?php
+
+namespace Modules\Core\Customer\Services;
+
+use Illuminate\Contracts\Auth\Authenticatable;
+use Illuminate\Pagination\LengthAwarePaginator;
+use Illuminate\Support\Arr;
+use Illuminate\Support\Facades\Event;
+use Lunar\Models\Address;
+use Lunar\Models\Order;
+use LogicException;
+use Modules\Core\Customer\Events\CustomerAddressCreated;
+use Modules\Core\Customer\Events\CustomerAddressDeleted;
+use Modules\Core\Customer\Events\CustomerAddressUpdated;
+use Modules\Core\Customer\Events\CustomerProfileUpdated;
+use Modules\Core\Customer\Exceptions\AddressNotFoundException;
+use Modules\Core\Customer\Exceptions\OrderNotFoundException;
+use Modules\Core\Customer\Models\Customer;
+
+/**
+ * The storefront-facing "My Account" API — mirrors Modules\Core\Cart\
+ * Services\CartService's shape, one boboko-owned service a storefront
+ * calls, so Lunar's own Customer/Order/Address models stay an
+ * implementation detail. Every method is scoped to the given
+ * Authenticatable's own Customer::latestCustomer() (see docs/modules.md
+ * "Customer/User Pairing") — there is no method here that accepts a bare
+ * order/address id without also requiring the owning user, precisely so
+ * a controller built on top of this can't accidentally leak one
+ * customer's data to another by trusting a client-supplied id alone.
+ *
+ * $user->latestCustomer() can be null for a User that has no paired
+ * Customer yet (shouldn't happen via the normal OTP-login cascade — see
+ * Modules\Core\Auth\Events\UserCreated — but is defended against anyway,
+ * since nothing stops a User row existing without one, e.g. seeded data)
+ * — every method returns an empty/null result rather than throwing in
+ * that case, since "no customer paired yet" isn't a not-found error, it's
+ * a legitimately empty account.
+ *
+ * Address/profile writes go through an explicit column allowlist
+ * (WRITABLE_ADDRESS_FIELDS/WRITABLE_PROFILE_FIELDS) rather than trusting
+ * Lunar\Models\Address/Customer's own $guarded = [] — that flag makes
+ * every column mass-assignable at the model layer, including
+ * customer_id on addresses, so a caller passing through an unfiltered
+ * request array (a real risk for a storefront controller built directly
+ * against this service) could otherwise reassign an address to a
+ * different customer entirely, or overwrite created_at/id. Arr::only()
+ * silently drops anything not on the allowlist rather than erroring —
+ * this is a safety boundary, not form validation (a storefront still
+ * validates its own request shape before calling this).
+ *
+ * Authorization here IS the ownership scoping itself, not a separate
+ * layer bolted on top — there is deliberately no Laravel Policy/Gate
+ * class for Order/Address, since a policy is meaningless without a
+ * controller calling authorize() against it, and this branch is scoped
+ * to backend services only (no routes/controllers — see the branch's own
+ * commit history). Every public method below takes Authenticatable $user
+ * as a required first argument and resolves everything else (Order,
+ * Address, Customer) strictly through that user's own
+ * latestCustomer() — there is no method that looks anything up by a bare
+ * id alone. A future storefront controller cannot "forget" the
+ * authorization check the way it could with a separate policy class,
+ * because the check IS how every lookup happens; skipping it isn't an
+ * option the method signatures allow.
+ */
+class CustomerAccountService
+{
+    private const WRITABLE_ADDRESS_FIELDS = [
+        'title', 'first_name', 'last_name', 'company_name',
+        'line_one', 'line_two', 'line_three', 'city', 'state', 'postcode',
+        'delivery_instructions', 'contact_email', 'contact_phone',
+        'country_id', 'shipping_default', 'billing_default',
+    ];
+
+    private const WRITABLE_PROFILE_FIELDS = [
+        'title', 'first_name', 'last_name', 'company_name', 'vat_no',
+    ];
+
+    public function customer(Authenticatable $user): ?Customer
+    {
+        /** @var Customer|null */
+        return $user->latestCustomer();
+    }
+
+    /**
+     * Placed orders only (placed_at IS NOT NULL) — a draft/abandoned
+     * order with no placed_at is checkout-in-progress state, not
+     * something that belongs in order history.
+     */
+    public function orders(Authenticatable $user, int $perPage = 15): LengthAwarePaginator
+    {
+        $customer = $this->customer($user);
+
+        if (! $customer) {
+            return new LengthAwarePaginator([], 0, $perPage);
+        }
+
+        return $customer->orders()
+            ->whereNotNull('placed_at')
+            ->latest('placed_at')
+            ->paginate($perPage);
+    }
+
+    /**
+     * @throws OrderNotFoundException if $orderId doesn't belong to this
+     *   customer, or belongs to a draft (never placed) order
+     */
+    public function order(Authenticatable $user, int $orderId): Order
+    {
+        $customer = $this->customer($user);
+
+        $order = $customer
+            ?->orders()
+            ->whereNotNull('placed_at')
+            ->with(['lines', 'shippingAddress', 'billingAddress', 'transactions', 'shipments'])
+            ->find($orderId);
+
+        if (! $order) {
+            throw new OrderNotFoundException;
+        }
+
+        return $order;
+    }
+
+    public function addresses(Authenticatable $user): iterable
+    {
+        $customer = $this->customer($user);
+
+        return $customer?->addresses ?? collect();
+    }
+
+    /**
+     * @param  array<string, mixed>  $data  Any key not in
+     *   WRITABLE_ADDRESS_FIELDS is silently dropped — see this class's
+     *   own docblock.
+     */
+    public function createAddress(Authenticatable $user, array $data): Address
+    {
+        $customer = $this->customerOrFail($user);
+
+        $address = $customer->addresses()->create(Arr::only($data, self::WRITABLE_ADDRESS_FIELDS));
+
+        $this->enforceSingleDefault($customer, $address);
+        $address->refresh();
+
+        Event::dispatch(new CustomerAddressCreated($address, $user));
+
+        return $address;
+    }
+
+    /**
+     * @throws AddressNotFoundException if $addressId doesn't belong to
+     *   this customer
+     */
+    public function updateAddress(Authenticatable $user, int $addressId, array $data): Address
+    {
+        $address = $this->ownedAddress($user, $addressId);
+        $old = $address->only(array_keys(Arr::only($data, self::WRITABLE_ADDRESS_FIELDS)));
+
+        $address->update(Arr::only($data, self::WRITABLE_ADDRESS_FIELDS));
+
+        $this->enforceSingleDefault($address->customer, $address);
+        $address->refresh();
+
+        Event::dispatch(new CustomerAddressUpdated($address, $old, $user));
+
+        return $address;
+    }
+
+    /**
+     * @throws AddressNotFoundException if $addressId doesn't belong to
+     *   this customer
+     */
+    public function deleteAddress(Authenticatable $user, int $addressId): void
+    {
+        $address = $this->ownedAddress($user, $addressId);
+        $snapshot = $address->getAttributes();
+
+        $address->delete();
+
+        Event::dispatch(new CustomerAddressDeleted($snapshot, $user));
+    }
+
+    /**
+     * Lunar has no built-in action enforcing "at most one shipping
+     * default / one billing default per customer" — a raw update() could
+     * otherwise leave two addresses both flagged shipping_default. Runs
+     * after every create/update, unconditionally (cheap — at most two
+     * single-row UPDATEs, only fired when the just-written address
+     * itself is a default), clearing the flag on every OTHER address of
+     * the same customer.
+     */
+    private function enforceSingleDefault(Customer $customer, Address $address): void
+    {
+        if ($address->shipping_default) {
+            $customer->addresses()->where('id', '!=', $address->id)->update(['shipping_default' => false]);
+        }
+
+        if ($address->billing_default) {
+            $customer->addresses()->where('id', '!=', $address->id)->update(['billing_default' => false]);
+        }
+    }
+
+    /**
+     * @throws AddressNotFoundException if $addressId doesn't belong to
+     *   this customer
+     */
+    private function ownedAddress(Authenticatable $user, int $addressId): Address
+    {
+        $customer = $this->customer($user);
+
+        $address = $customer?->addresses()->find($addressId);
+
+        if (! $address) {
+            throw new AddressNotFoundException;
+        }
+
+        return $address;
+    }
+
+    /**
+     * @param  array<string, mixed>  $data  Any key not in
+     *   WRITABLE_PROFILE_FIELDS is silently dropped — see this class's
+     *   own docblock.
+     */
+    public function updateProfile(Authenticatable $user, array $data): Customer
+    {
+        $customer = $this->customerOrFail($user);
+        $old = $customer->only(array_keys(Arr::only($data, self::WRITABLE_PROFILE_FIELDS)));
+
+        $customer->update(Arr::only($data, self::WRITABLE_PROFILE_FIELDS));
+        $customer->refresh();
+
+        Event::dispatch(new CustomerProfileUpdated($customer, $old, $user));
+
+        return $customer;
+    }
+
+    /**
+     * @throws LogicException if $user has no paired Customer at all —
+     *   distinct from AddressNotFoundException/OrderNotFoundException
+     *   (which mean "this id isn't yours"), this means the account
+     *   itself is in an invariant-violating state the normal OTP-login
+     *   cascade should never produce.
+     */
+    private function customerOrFail(Authenticatable $user): Customer
+    {
+        $customer = $this->customer($user);
+
+        if (! $customer) {
+            throw new LogicException('This user has no paired Customer record.');
+        }
+
+        return $customer;
+    }
+}
diff --git a/src/Logging/ActivityLogService.php b/src/Logging/ActivityLogService.php
index afc3f6e..30ce3d2 100644
--- a/src/Logging/ActivityLogService.php
+++ b/src/Logging/ActivityLogService.php
@@ -2,25 +2,31 @@
 
 namespace Modules\Core\Logging;
 
+use Illuminate\Contracts\Auth\Authenticatable;
 use Illuminate\Database\Eloquent\Model;
 
 /**
  * Thin wrapper around Spatie Activity Log that standardises the log channel,
- * actor (authenticated staff member), and property shape for all domain events.
+ * actor, and property shape for all domain events.
  *
  * All logs are written to the 'lunar' channel. The subject is always an
- * Eloquent model, and the actor is resolved from the 'staff' guard at call time.
+ * Eloquent model. $causer defaults to the 'staff' guard's current user —
+ * every existing caller of this class is admin-side — but can be passed
+ * explicitly for a non-staff actor (e.g. a customer editing their own
+ * address on the `web` guard — see Modules\Core\Customer\Services\
+ * CustomerAccountService, which passes the acting User rather than
+ * relying on this default resolving to null for a web-guard session).
  */
 class ActivityLogService
 {
     /**
      * Log a creation event. $attributes describes the initial state.
      */
-    public function created(Model $subject, array $attributes): void
+    public function created(Model $subject, array $attributes, ?Authenticatable $causer = null): void
     {
         activity('lunar')
             ->performedOn($subject)
-            ->causedBy(auth('staff')->user())
+            ->causedBy($causer ?? auth('staff')->user())
             ->withProperties(['attributes' => $attributes])
             ->log('created');
     }
@@ -28,11 +34,11 @@ class ActivityLogService
     /**
      * Log an update event. $old holds the previous values, $attributes the new ones.
      */
-    public function updated(Model $subject, array $old, array $attributes): void
+    public function updated(Model $subject, array $old, array $attributes, ?Authenticatable $causer = null): void
     {
         activity('lunar')
             ->performedOn($subject)
-            ->causedBy(auth('staff')->user())
+            ->causedBy($causer ?? auth('staff')->user())
             ->withProperties(['old' => $old, 'attributes' => $attributes])
             ->log('updated');
     }
@@ -40,11 +46,11 @@ class ActivityLogService
     /**
      * Log a failed operation. $attributes provides context (e.g. error message, service).
      */
-    public function failed(Model $subject, array $attributes): void
+    public function failed(Model $subject, array $attributes, ?Authenticatable $causer = null): void
     {
         activity('lunar')
             ->performedOn($subject)
-            ->causedBy(auth('staff')->user())
+            ->causedBy($causer ?? auth('staff')->user())
             ->withProperties(['attributes' => $attributes])
             ->log('failed');
     }
@@ -52,11 +58,11 @@ class ActivityLogService
     /**
      * Log a deletion event. $attributes provides context (e.g. reason, name).
      */
-    public function deleted(Model $subject, array $attributes): void
+    public function deleted(Model $subject, array $attributes, ?Authenticatable $causer = null): void
     {
         activity('lunar')
             ->performedOn($subject)
-            ->causedBy(auth('staff')->user())
+            ->causedBy($causer ?? auth('staff')->user())
             ->withProperties(['attributes' => $attributes])
             ->log('deleted');
     }
diff --git a/src/Providers/CustomerServiceProvider.php b/src/Providers/CustomerServiceProvider.php
index 525006c..4b5f995 100644
--- a/src/Providers/CustomerServiceProvider.php
+++ b/src/Providers/CustomerServiceProvider.php
@@ -7,7 +7,12 @@ use Illuminate\Support\ServiceProvider;
 use Lunar\Facades\ModelManifest;
 use Lunar\Models\Contracts\Customer as LunarCustomer;
 use Modules\Core\Auth\Events\UserCreated;
+use Modules\Core\Customer\Events\CustomerAddressCreated;
+use Modules\Core\Customer\Events\CustomerAddressDeleted;
+use Modules\Core\Customer\Events\CustomerAddressUpdated;
+use Modules\Core\Customer\Events\CustomerProfileUpdated;
 use Modules\Core\Customer\Listeners\CreateCustomerForUser;
+use Modules\Core\Customer\Listeners\LogCustomerAccountActivity;
 use Modules\Core\Customer\Models\Customer;
 
 class CustomerServiceProvider extends ServiceProvider
@@ -17,5 +22,10 @@ class CustomerServiceProvider extends ServiceProvider
         ModelManifest::replace(LunarCustomer::class, Customer::class);
 
         Event::listen(UserCreated::class, CreateCustomerForUser::class);
+
+        Event::listen(CustomerAddressCreated::class, [LogCustomerAccountActivity::class, 'handleAddressCreated']);
+        Event::listen(CustomerAddressUpdated::class, [LogCustomerAccountActivity::class, 'handleAddressUpdated']);
+        Event::listen(CustomerAddressDeleted::class, [LogCustomerAccountActivity::class, 'handleAddressDeleted']);
+        Event::listen(CustomerProfileUpdated::class, [LogCustomerAccountActivity::class, 'handleProfileUpdated']);
     }
 }