paypalpaypal-rest-sdkpayflowpropayflowlink

Payflow reports "User authentication failed"

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.

Solution

  • 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.