Submit external form to Gravity forms

Hello,

I want to know if it is possible to submit the data of a custom form to gravityforms.
I already have a form with gravityforms. Now we made a form in a different page not connected to the wordpress. I would like to submit the form data of that form to my existing gravityforms form so that the data will go into the entries and send notifications.

Yes, you can do that using the REST API: