I have the same problem. Just posted the question in Stack Over Flow. https://stackoverflow.com/questions/60517890/refund-not-working-for-paypalrestsdk-using-python Did you manage to find a solution? Maybe use an older version of paypalrestsdk? I recall the refund worked when I used it 6 months ago. Now it doesn't work. I think you need a 17 length string composed of letters and numbers. My current paypalrestsdk is 1.13.1. What version are you using?
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