Hi All, I want to integrate a third-party hosted checkout solution with our Shopify Plus store. The goal is to redirect customers from Shopify’s checkout page to the third-party’s secure hosted payment page to complete transactions and then return them back to Shopify after payment success or failure. The integration should use Shopify’s Payments Apps API to function as a custom payment gateway app that supports full order data exchange (amount, currency, order ID, and callback URLs). Additionally, the setup must comply with Shopify Plus policies and ensure Shopify’s standards.
