Make payments dependency injected based on the .env settings

docker-compose.yml

@@ -5,7 +5,9 @@ services:
     image: mistox-website:latest
     restart: always
     environment:
+      - PaymentService=${Payment_Service}
       - StripeKey=${Stripe_Key}
+      - StripeEndpointSecret=&{Stripe_Endpoint_Secret}
       - MySQLServer=${MySQL_Server}
       - MySQLUser=${MySQL_User}
       - MySQLPass=${MySQL_Pass}