How to Add custom UI extension in Shoppay App

Shopify Apps
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Topic summary

A developer building warranty and protection plan solutions for Shopify merchants is seeking to extend their functionality into the Shop Pay app. They currently offer warranty upsells and UI customizations on Product Detail Pages (PDP) and checkout flows.

Key Questions:

  • Whether Shop Pay supports third-party UI extensions or widgets within its app interface (product browsing, store listings)
  • Availability of APIs, SDKs, or partner programs for such customizations
  • Best practices for delivering warranty upsells to Shop Pay users if direct integration isn’t possible

Current Status:
The discussion remains open with no responses yet. The developer is looking for official documentation, API guidance, or community experiences related to Shop Pay extensibility.

Summarized with AI on October 26. AI used: claude-sonnet-4-5-20250929.
1

Hi Shopify Community,

I’m a developer working on warranty and protection plan solutions for Shopify merchants. Currently, I add warranty offers and UI customizations on the merchants’ Product Details Pages (PDP) and checkout flows.

I want to explore if there is any possibility to add custom UI extensions or upsell widgets directly inside the Shop Pay app—for example, on the product browsing pages or store listings within the Shop Pay mobile or web app.

Specifically, I’m looking for answers to these questions:

Does Shop Pay support third-party app or UI extensions inside its app interface?

Are there any APIs, SDKs, or partner programs to enable such customizations?

If this is not supported, what are the recommended best practices to provide warranty upsells effectively to customers who use Shop Pay?

I appreciate any insights, official documentation, or personal experiences that you can share.

Thanks in advance!