Feat: Creating PaymentMethods, Setting Fees, Availabilities

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.");
+    }
+}