I would like to know how to redirect payment requests to my payment gateway API using a custom Shopify app. According to Shopify’s Help Center Assistant, this should be possible.
So far, I have created a custom app in my Shopify admin panel (Settings > Apps and Sales Channels > Develop Apps). I have also configured the Admin API integration with write_orders and read_orders access scopes, and set the webhook version to 2025-01.
Shopify does not allow direct redirection of checkout payments to an external gateway through a custom app unless you are on Shopify Plus and using the Hosted Payment SDK.
However, if your gateway is not natively supported, you can:
Use Shopify’s payments app SDK – This is the approved way to integrate third-party payment gateways.
Set Up a manual payment method – If your gateway supports manual invoicing, you can list it as an alternative payment option.
Consider Shopify plus – If you’re on Plus, you may be able to create a private payment gateway integration.
Check Shopify’s Payments App documentation or reach out to Shopify Partner Support to confirm eligibility