How to trigger a submission after POST (GF API v2)

I have created a connection to a form which collects data for a document. My goal is to auto-submit this data so it can then be sent to WP eSignature, creating a legally binding document. Unfortunately, WP eSignature doesn’t have an API. My connection works well, and the data is correctly populated into Gravity Forms. However, the problem I’m having is that the data is simply populated and it doesn’t actually “submit” the form data. I need this to be submitted in order to trigger WP eSignature. Is there a way to instruct Gravity Forms to behave this way, once the POST request is sent/received? Ideally, I’d like this to be done via the payload.

Thanks in advance!