moved website outside of panel folder

Website/classes/PaymentGatewayInterface.php

@@ -0,0 +1,40 @@
+<?php
+/**
+ * Payment Gateway Interface
+ * All payment providers must implement this contract.
+ */
+interface PaymentGatewayInterface
+{
+    /**
+     * Create a payment/order on the provider side.
+     * @param array $params { amount, currency, invoice_id, description, return_url, cancel_url, items? }
+     * @return array { success: bool, provider_order_id: string, redirect_url?: string, error?: string }
+     */
+    public function createPayment(array $params): array;
+
+    /**
+     * Handle a provider callback/capture (webhook or return).
+     * @param array $params Provider-specific parameters (e.g. { order_id } for PayPal)
+     * @return array { success: bool, transaction_id: string, amount: float, status: string, raw_response: array, error?: string }
+     */
+    public function handleCallback(array $params): array;
+
+    /**
+     * Verify that a payment/webhook is authentic.
+     * @param array $payload  Raw request body / headers
+     * @return bool
+     */
+    public function verifyPayment(array $payload): bool;
+
+    /**
+     * Get the provider's external transaction ID from a capture result.
+     * @param array $captureResult Result from handleCallback()
+     * @return string|null
+     */
+    public function getTransactionId(array $captureResult): ?string;
+
+    /**
+     * Return a short machine name for this gateway (e.g. 'paypal', 'stripe', 'manual').
+     */
+    public function getName(): string;
+}