Quote Originally Posted by Fjolsvith View Post
Square did a change to their API that has broken this module.
Um ... The error suggests that you've changed the PHP files associated with this module. If it was something Square did only on their end, the error would be different.

What's the back-story of changes to the PHP files?

Which set of files are you using? v0.9xxx? or 1.0-beta? Or a hybrid of files that you've changed independently?