OK Alex, I am stepping in here to see if you and I can get this resolved.
Here is the URL being sent to the Boonex shop, is it correct? Outside of the redacted bits of course.
https://d.una.io/m/oauth2/auth?response_type=code&client_id=REDACTED&redirect_uri=http://REDACTED/studio/store.php?page=goodies&scope=market&state=M3AGA4Q7axw4sPWc9rLe
Which returns The client id supplied is invalid. Now, the client id is not invalid, I checked and I entered it myself and checked several times to make sure of no errors.
And when I scroll down the page what are these two?
Warning: Cannot modify header information - headers already sent by (output started at /home/unaio/d/inc/classes/BxDolTemplate.php:2391) in /home/unaio/d/inc/classes/BxDolTemplate.php on line 2389
Warning: Cannot modify header information - headers already sent by (output started at /home/unaio/d/inc/classes/BxDolTemplate.php:2391) in /home/unaio/d/inc/classes/BxDolTemplate.php on line 2390