This means that the Client ID that you have entered in the PayPal setup in your OneAll account is not correct. Please follow the PayPal setup guide in your OneAll account and make sure that you copy/paste the Client ID/Secret exactly as indicated in the setup guide.
My bad. I copied the sandbox Client ID/Secret instead. It's now fine once I put in the Live credentials. However, I now get this error. http://prntscr.com/6ctg3p
I have verified that the correct redirect URI was entered. Oneall instructions: http://prntscr.com/6cthdd
Answers
However, I now get this error.
http://prntscr.com/6ctg3p
I have verified that the correct redirect URI was entered.
Oneall instructions:
http://prntscr.com/6cthdd
Paypal config:
http://prntscr.com/6cthrd