How do I add and redirect to a custom payment site from the checkout page?

Payments + Shipping & Fulfilment

Topic summary

Main issue: Store owners want to redirect customers from Shopify checkout to a custom payment site, passing order ID, price, and other parameters.

Key guidance shared:

  • Direct checkout code modifications are not allowed unless on the Shopify Plus plan (which permits checkout customization).
  • A workaround is to add an external option as a Manual payment method, where customers pay off-site and the merchant manually approves the order afterward.

Latest updates:

  • The original poster accepted the limitation and requested a script/example for implementing the redirect on Plus, and asked how to add a custom payment method to any store.
  • Another participant has the same need, cannot find an option to upgrade to Shopify Plus, and can’t locate documentation on creating custom checkout redirects.

Definitions:

  • Shopify Plus: Higher-tier plan with access to checkout customization features.
  • Manual payment method: Offsite payment arrangement requiring manual order approval.

Status/outstanding questions:

  • No code, steps, or confirmation on redirect implementation were provided.
  • How to perform the redirect on Plus and how to upgrade/access Plus remain unanswered. The discussion is open with pending guidance on implementation details.
Summarized with AI on January 20. AI used: gpt-5.
4

Hi,

I have the same requirement - to redirect to a custom payment gateway at checkout. I do not see any option to upgrade to Shopify PLUS plan and can not find any information on creating custom redirects from checkout anywhere. Can you please assist.