Use custom app to redirect payment requests to my payment gateway API

Payments + Shipping & Fulfilment
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Topic summary

A user wants to redirect payment requests from their Shopify store to a custom payment gateway API using a custom app. They’ve already created a custom app with Admin API integration (write_orders and read_orders scopes) and configured webhooks.

Another participant clarifies that Shopify does not permit direct checkout payment redirection to external gateways through custom apps unless on Shopify Plus with the Hosted Payment SDK.

Alternative approaches suggested:

  • Use Shopify’s Payments App SDK (the official method for third-party gateway integration)
  • Set up a manual payment method if the gateway supports manual invoicing
  • Upgrade to Shopify Plus for private payment gateway integration capabilities

The discussion remains open with a recommendation to consult Shopify’s Payments App documentation or contact Shopify Partner Support to verify eligibility and implementation options.

Summarized with AI on October 31. AI used: claude-sonnet-4-5-20250929.
1

Good day!

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.

2

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:

  1. Use Shopify’s payments app SDK – This is the approved way to integrate third-party payment gateways.
  2. Set Up a manual payment method – If your gateway supports manual invoicing, you can list it as an alternative payment option.
  3. 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

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