Add Stripe payment intents support and product subscription flag

Introduced functionality for handling Stripe payment intents, including creation, retrieval, and cancellation. Added a subscription_allowed flag to products for enabling subscription-specific operations. Integrated the necessary backend endpoints, object property updates, and route handling logic.

services/nginx/app/classes/stripe.php

@@ -9,6 +9,7 @@ require_once WD . '/modules/stripe/endpoints/stripe_endpoint_product.php';
 require_once WD . '/modules/stripe/endpoints/stripe_endpoint_prices.php';
 require_once WD . '/modules/stripe/endpoints/stripe_endpoint_invoice.php';
 require_once WD . '/modules/stripe/endpoints/stripe_endpoint_readers.php';
+require_once WD . '/modules/stripe/endpoints/stripe_endpoint_payment_intents.php';
 
 
 // Require all helper classes
@@ -22,6 +23,7 @@ use Exception;
 use interfaces\stripe_i;
 use stripe\endpoints\stripe_endpoint_customers;
 use stripe\endpoints\stripe_endpoint_invoice;
+use stripe\endpoints\stripe_endpoint_payment_intents;
 use stripe\endpoints\stripe_endpoint_payment_link;
 use stripe\endpoints\stripe_endpoint_prices;
 use stripe\endpoints\stripe_endpoint_product;
@@ -70,6 +72,11 @@ class stripe implements stripe_i
      * @var stripe_endpoint_readers
      */
     public stripe_endpoint_readers $readers;
+    /**
+     * Payment intents endpoint
+     * @var stripe_endpoint_payment_intents
+     */
+    public stripe_endpoint_payment_intents $payment_intents;
     /**
      * Stripe client
      * @var StripeClient
@@ -86,6 +93,7 @@ class stripe implements stripe_i
         $this->prices = new stripe_endpoint_prices();
         $this->invoice = new stripe_endpoint_invoice();
         $this->readers = new stripe_endpoint_readers();
+        $this->payment_intents = new stripe_endpoint_payment_intents();
     }
 
     /**