Echo sign login without redirecting to Adobe login page using API.

We are using adobe sign to send an agreement pdf with esign space of two parties. When sending agreement one to another party it requires login with adobe. It redirects to adobe login screen and need to login every time to send an agreement.

Is there any way to login without redirect to adobe login screen? We creating such a system where a single adobe account can be used to share agreement for/from each of our site users without their individual adobe account. 

We are using angular as the front end and Asp.net as the backend. Please provide such a solution if exist.

Thanks.