Rename gateway main method to process

src/Library/Economy/Payment/GatewayInterface.php

@@ -35,7 +35,7 @@ interface GatewayInterface
      *
      * @return GatewayCheckout The GatewayCheckout updated with the data given by the gateway
      */
-    public function sendData(GatewayCheckout $checkout): GatewayCheckout;
+    public function process(GatewayCheckout $checkout): GatewayCheckout;
 
     /**
      * When a user is redirected by the gateway we must handle the redirection

src/Library/Economy/Payment/StripeGateway.php

@@ -42,7 +42,7 @@ class StripeGateway implements GatewayInterface
         return 'stripe';
     }
 
-    public function sendData(GatewayCheckout $checkout): GatewayCheckout
+    public function process(GatewayCheckout $checkout): GatewayCheckout
     {
         $session = $this->stripe->checkout->sessions->create([
             'customer_email' => $checkout->getOrigin()->getUser()->getEmail(),