[Bug]: Error in refund method

[pabloriquelmecas]

What happened?

When I use the method transactions.refund, the sdk trows an error but processes the refund without a problem, the SDK sends an API error making it unsafe for process and check refunds issued by code.

from sumup import Sumup
client = Sumup(api_key="API")
merchant = "MERCHANT"
result = client.transactions.refund(merchant_code=merchant,transaction_id="TRANSACTION_ID")
Traceback (most recent call last):
  File "<pyshell#9>", line 1, in <module>
    result = client.transactions.refund(merchant_code=merchant,transaction_id="TRANSACTION_ID")
  File "C:\Users\Pablo\AppData\Local\Programs\Python\Python313\Lib\site-packages\sumup\transactions\resource.py", line 156, in refund
    raise APIError(f"Unexpected response", status=resp.status_code, body=resp.text)
sumup._exceptions.APIError: Unexpected response

After that execution, I checked on the Sumup dashboard and the transaction was refunded without a problem.

Relevant code or error output

SDK version

0.3.0

Python version

3.13

Operating system

Windows

Additional context

No response

[matoous]

Hi @pabloriquelmecas , thanks for reporting. The issue is that the refund request is proxied to 2 different systems based on which one processed the transaction. Those 2 systems return different success responses. I am preparing a fix upstream as right now the behavior is correct for one but wrong for the other.

[matoous]

Hi @pabloriquelmecas, we have updated the API and improved the typing in the latest version of the SDK, thanks for reporting.