Quote Originally Posted by DrByte View Post
Hmm, I haven't seen any problem when using a Canadian Square account.

- created the App in Square
- obtained the oAuth stuff, and told Square the URL to the store
- put the app credentials into Zen Cart, saved those settings
- click the green Token button
- login to Square
- return to store admin, refresh the page, green button goes away
- click Edit and choose the Location from the dropdown, click Save
- ready to take payments
Thank you DrByte.
Found the problem looking at the reference link of the error message. The Application ID inserted in Zen Cart module repeated the few characters "sq0idp-" that were left from initial blank module.
Now working.
Thank you again.