I use the script php-soundcloud (Oauth 2) and want to change the title (Buy this track) of purchase link.
I can update the link but I can not change the text of link.

I use this code:
$soundcould->put('https://api.soundcloud.com/tracks/56649403', array(
'track[purchase_url]' => 'http://website.com/',
'track[purchase_title]' => 'Support me' // whitout this, it work
));
but it returns me an error: The requested URL responded with HTTP code 422.
When i remove track[purchase_title], it work, so the problem is that variable!
Must be something special to change the link title?
Soundcloud have posed limits on the use of their API?
It’s possible to create a new link other than changing the variable purchase_title?
The reason this is not working is because the purchase_url and purchase_title can only be changed on premium accounts. I’ll look at making this more clear in the docs!
Here’s a code sample that will do the trick for a premium account:
If that doesn’t work, the problem is elsewhere. Email me and I can help you debug further.