Use-case of creating dynamic pdf and getting it signed inside application

I have two different use cases for which I want to know what approach we should use on Adobe

UseCase 1

There will be the pdf files stored on my own server, when a user opens it on the application it should be loaded on the pdf viewer where there must be an option to sign that pdf, once the pdf is signed by the user, the signed pdf must be updated. this should happen inside my application.

UseCase 2

On some action from the user, the data will be pulled from the database, and pdf will be generated dynamically depending on retrieved data and it must be presented to the user on the viewer, On the viewer, the user can view it and can sign it. on submitting, the signed pdf must be uploaded on my server (in this case the signed pdf must be available on the application side to be uploaded on the server). 

Are these scenarios possible with Adobe?

Adobe Sign-In programmatically!

I checked the documentation on adobe for generating the access token in Adobe Sign API but it provides the option of OAuth where the user has to interact, but In my use case it should happen programmatically without user intervention.