Do we have APIs for SharePoint eSignature services?

Question

Hi All,

I have gone through the below YouTube link and documentation. I want to integrate the e-Signature in my system through APIs and I'm not using the SharePoint user interface.

1. Can you confirm if there are any APIs currently available for use?
2. In the video link below, it is only possible to type the name for signature, are there provisions to sign by mouse scribbling?

Securely digitize document workflows with eSignature in Microsoft 365 | OD17 (youtube.com)

Set up SharePoint eSignature - Microsoft Syntex | Microsoft Learn