I have the same problem mentioned in this topic
When creating a new app, the callback URL input field only accepts a certain number of characters, which means the URL I need to use won’t fit.
I’m assuming there is nothing to be done about this, but my question is:
Why does the URL I enter still redirect correctly with the missing characters?
URL I need to enter: http:// domain.com/sub/sub/sub/sub/sub/sub/hybridauth?hauth.done=Twitter
URL (that still works with missing characters): http:// doma [missing characters here] /sub/sub/sub/sub/sub/sub/hybridauth?hauth.done=Twitter
(ignore the spaces after http://)