Hi all,
One of the merchants has recently found out that our shipping calculation app is not compatible with International Duties & Taxes feature by Shopify. Shopify support has confirmed this to him.
The GraphQL admin API our app uses: carrierService - GraphQL Admin (2025-01)
The way the issue is reproduced: when there are shipping methods and rates from our app are displayed at checkout Shopify doesn’t calculate duties & taxes.
Question: so how can we (app developers) solve this compatibility issue?
Can someone please point us to the right direction? So far I found nothing related to this issue in the Community. And there is only a tiny mention in the guide here - https://help.shopify.com/en/manual/international/duties-and-import-taxes/considerations#third-party-apps
Thanks.