Adobe Acrobat Sign

Works but not covering all API commands and there's a few bugs in some of the data types (Visibility data type and Search API)

This is used for attended processes. The OAuth authentication makes you sign in first to let the app act on your behalf. After authentication, you can run it as an unattended process until the token expires. Unfortunately no way to use parallel activities to authenticate automatically while the Applicatios scope activity is waiting for your authentication credentials.