Backup shipping rates do not appear when using CarrierService API

Technical Q&A
1

Hi, I have a question about CarrierService API and the backup shipping rates.

I’m testing my app which calculates shipping rates using CarrierService API on development store.

https://shopify.dev/api/admin-rest/2022-10/resources/carrierservice

The official help article says that ‘Backup shipping rates’ will appear on Shipping page of checkout when the app couldn’t return calculated shipping rates due to app down or timeout.

https://help.shopify.com/en/manual/shipping/setting-up-and-managing-your-shipping/backup-shipping-ra…

However, the backup shopping rates never appeared at checkout even if I forced timeout my app. It only shows the error message and can’t proceed the checkout.

Is there any required steps to show the backup shipping rates?

  • I activated the backup shipping rates by selecting Show backup rates when app or carrier rates aren’t available. checkbox on settings (default).
2

just share updates: I’ve been contacting Shopify Support about this and today they said they’ve resolved this issue. Now I could see the backup shipping rates when timeout or server error.