Feat: Creating PaymentMethods, Setting Fees, Availabilities

src/Checkout/Events/PaymentMethodSelected.php

@@ -0,0 +1,20 @@
+<?php
+
+namespace Modules\Core\Checkout\Events;
+
+use Lunar\Models\Cart;
+
+/**
+ * Dispatched by CheckoutService::selectPaymentMethod() — carries the plain
+ * type key (e.g. 'cash-on-delivery', 'stripe'), same convention as
+ * CartService's events (a plain reference the listener resolves further
+ * itself, rather than an already-resolved object) since a payment type key
+ * has nothing further to eagerly resolve the way a ShippingOption does.
+ */
+class PaymentMethodSelected
+{
+    public function __construct(
+        public readonly Cart $cart,
+        public readonly string $type,
+    ) {}
+}

src/Checkout/Exceptions/UnknownPaymentTypeException.php

@@ -0,0 +1,21 @@
+<?php
+
+namespace Modules\Core\Checkout\Exceptions;
+
+use RuntimeException;
+
+/**
+ * Thrown by CheckoutService::selectPaymentMethod()/confirmPayment() when
+ * $type doesn't resolve to a registered Modules\Core\Checkout\Contracts\
+ * PaymentDriver (config('payment.drivers')) — same reasoning as
+ * InvalidShippingOptionException: nothing here has a matching Lunar
+ * exception type to reuse, so this is the boboko-owned signal instead of a
+ * silent no-op or an opaque container-resolution error.
+ */
+class UnknownPaymentTypeException extends RuntimeException
+{
+    public function __construct(public readonly string $type)
+    {
+        parent::__construct("The payment type \"{$type}\" is not registered.");
+    }
+}

src/Checkout/Services/CheckoutService.php

@@ -12,11 +12,14 @@ use Lunar\Facades\ShippingManifest;
 use Lunar\Models\Cart;
 use Lunar\Models\Order;
 use Modules\Core\Cart\Services\CartService;
+use Modules\Core\Checkout\Contracts\PaymentDriver;
 use Modules\Core\Checkout\Events\BillingAddressSet;
 use Modules\Core\Checkout\Events\OrderPlaced;
+use Modules\Core\Checkout\Events\PaymentMethodSelected;
 use Modules\Core\Checkout\Events\ShippingAddressSet;
 use Modules\Core\Checkout\Events\ShippingOptionSelected;
 use Modules\Core\Checkout\Exceptions\InvalidShippingOptionException;
+use Modules\Core\Checkout\Exceptions\UnknownPaymentTypeException;
 
 /**
  * Storefront-facing checkout operations, mirroring
@@ -123,4 +126,63 @@ class CheckoutService
 
         return $order;
     }
+
+    /**
+     * Records which payment type the shopper picked (Cart::meta
+     * ['payment_method']) — read by e.g. Modules\Core\Payment\Pipelines\
+     * Cart\ApplyCashOnDeliveryFee to add that type's own cart-total
+     * adjustments before the shopper reaches placeOrder()/confirmPayment().
+     * Does not itself call a PaymentDriver — selecting a method and
+     * confirming payment against it are deliberately separate steps, same
+     * as selecting a shipping option happens before placing the order.
+     *
+     * @throws UnknownPaymentTypeException if $type has no registered
+     *   PaymentDriver (config('lunar.payments.types.<type>.payment_driver'))
+     */
+    public function selectPaymentMethod(string $type): Cart
+    {
+        $this->paymentDriverFor($type);
+
+        $cart = $this->cart->currentOrCreate();
+        $cart->meta = [...$cart->meta->toArray(), 'payment_method' => $type];
+        $cart->save();
+
+        Event::dispatch(new PaymentMethodSelected($cart, $type));
+
+        return $cart;
+    }
+
+    /**
+     * Resolves $type's registered PaymentDriver and calls confirm() —
+     * the driver decides whether/when the order actually gets placed (see
+     * Modules\Core\Checkout\Contracts\PaymentDriver's docblock). $data
+     * carries whatever that driver needs (Stripe's payment_intent id, a
+     * future redirect-based provider's callback payload).
+     *
+     * @param  array<string, mixed>  $data
+     *
+     * @throws UnknownPaymentTypeException if $type has no registered driver
+     * @throws \Lunar\Exceptions\FingerprintMismatchException
+     * @throws \Lunar\Exceptions\Carts\CartException
+     */
+    public function confirmPayment(string $type, string $fingerprint, array $data = []): Order
+    {
+        $driver = $this->paymentDriverFor($type);
+
+        return $driver->confirm($this->cart->currentOrCreate(), $fingerprint, $data);
+    }
+
+    /**
+     * @throws UnknownPaymentTypeException
+     */
+    private function paymentDriverFor(string $type): PaymentDriver
+    {
+        $driverClass = config("lunar.payments.types.{$type}.payment_driver");
+
+        if (! $driverClass) {
+            throw new UnknownPaymentTypeException($type);
+        }
+
+        return app($driverClass);
+    }
 }