Best Esign/Docusign API

Hey guys, our app is coming along quite well for about two years now. I love Bubble.

I am seeking input from anyone who has an api for docusign or some other esign, on what is the best APIs out there for this.

Currently we are using Adobe, but not their API. We have precreated web forms and our Agents can send a link to the webform via text or email to the client. Once then webform is signed it is then uploaded to our app.

This works pretty well for us. The issue is that it does not allow for dynamic forms/contracts.

Soon, we will be expanding our app to allow for other companies like ours to use, and the new users will need to able to create their own forms to send to their clients.

Any suggestions out there?