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I'm trying to use the RESTful API to issue a refund and Payflow responds with "User authentication failed." I've double-checked my API user credentials and it still isn't working.

redgeoff
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1 Answers1

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Through trial and error, I was able to determine that the PayPal API malfunctions when the API user's password contains some non-alphanumeric characters. I solved this by making our passwords alphanumeric (only letters and numbers). PayPal Manager will not complain if you enter a password that does not completely consist of letters and numbers.

redgeoff
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    You sir are a life saver. Seriously could have never figured out this solution. No where it is documented after a months of Frustration stumbled upon your answer and now I am breathing :) – Jeet Apr 15 '22 at 13:53