Oauth2 Connection Issue

I am having trouble connecting bubble to a third party app using Oauth2. I got it working in postman, but keep getting this error:

Any Suggestions?

If you don’t post a link to a the editor or at least the run mode page, it’s hard for others to help.

Here is the public link to the dev page That has the workflow to connect stripe.

The configuration can be found in the API Connector page.

That is not a publicly editable app it seems.

I got similar issue.
See my post here: http://forum.bubble.io/t/marketplace-payments-mango-pay/6776/12

Did you solve this ?