Version 4.0.0

BREAKING

• Moved ApiClient and ApiException under Client folder

Removed

• empty test placeholder files

Changed

• updated existing test cases to use JWT instead of the legacy auth (still not fully working yet)

Added

• OAuth models under Client/Auth folder
• new dependency for OAuth support (firebase/php-jwt)
• OAuthTests.php for OAuth support test

Fixed

• A bug with that could cause the moveEnvelopes method call to return a response without a Content-Type header. (DCM-2871)