Creating a payment button using API for a Shopify store

The client approached with the task of connecting a non-standard payment provider to Shopify. The provider only had an API but did not have a ready-made app or integration for Shopify.

I wrote a script that redirects the customer to the payment page after placing an order.

Everything works stably, the solution is fully compatible with Shopify. The client can now accept payments through their payment service without extra steps and third-party apps.