Front End REST Application to Update an Embedded Form

Hi All,
I have a front end web application (Vue SPA calling a Spring REST endpoint) that allows external customers to update a form in collaboration with the back office during a Camunda User Process.

I am looking for any resources and tips to query and update the embedded form from my external REST endpoint. The resources I have found seem to be quite old and I was looking for something or some advice that is more recent.

It is a basic three tier application with the backend obviously being the Camunda Process Engine. The back office staff use the task list and the customer get a public facing view of their form.

Thank You