Issue: Calculating a refund via Shopify Admin REST (2024-01) refunds calculate endpoint from a Remix app fails when attempting a partial shipping refund.
Details:
User stance: Suspects a potential API bug given the simplicity of the request, but is unsure and requests help.
Artifacts: Screenshots included (likely showing request payload and the 422 response); they are central to understanding the exact inputs/outputs.
Status: No resolution or workaround provided yet; discussion is open with the key question of why partial shipping refunds via the calculate endpoint are rejected while full refunds succeed.
I’m trying to calculate a refund via this REST endpoint in a Remix application.
When I calculate a refund with a full shipping refund - “shipping”: {“full_refund”: true} - everything works fine.
However, when I’m trying to do a partial shipping refund - “shipping”: {“amount”: 29} - it doesn’t work.
Instead, I get an HTTPError: Response code 422 (Unprocessable Entity).
It’s not the most difficult endpoint in the world, so I suspect a bug. But hard to tell.
Help? 
