Shipping Extensions

Topic summary

  • Goal: Update the Shipping Amount displayed during Shopify Plus checkout using a custom calculation from an app.

  • Context: The app successfully computes a custom shipping cost intended to replace the default value at checkout.

  • Problem: Unable to update the checkout’s shipping field within Shopify Plus despite having the calculated amount.

  • Request: Seeking experiences, guidance, or supported methods to programmatically set or modify the shipping amount in Shopify Plus checkout (e.g., feasible APIs, implementation approaches, or constraints).

  • Status: No responses or solutions provided yet; the question remains open.

Summarized with AI on December 30. AI used: gpt-5.

Has anyone had experience updating the Shipping Amount in checkout for ShopifyPlus? We are using our app to calculate a custom shipping amount but having trouble updating the shipping field in checkout within Plus.