I have set up a shop using OpenCart 3.
Now, when I attempt to link the "PayPal Commerce Platform" to the account, it seems to run through OK, then I go to save the settings, and get this error message:
"Authentication failed due to invalid authentication credentials or a missing Authorization header"
I cannot find any clear instructions in the FAQ about this error message and checked on my PayPal account for help - unfortunately the advise is as clear as mud and seems to refer to an earlier version of the software.
Any help appreciated.
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