Open a link to insert date (4 beginners)

Hello !! i’m here again.
Today’s problem is the following.
I understood how to create a flow in modeler and the criteria to use because the instance is viewble in cockpit.
Now i want to create something different; in particoular i wold like to know if is possible to open a link that bring me to a web service which allow me to put some data (personal, about a client for example).
So i want to know if i can collegate my modeler to an existent project java, which contains this option to make me insert data.

I hope I was understandable !! sorry for my english and sorry for my incompetence !!

You could open a web-frontend by pasting its link into the form-key-field of an user task.
But your web-frontend must be capable to communicate with Camunda via REST, since it only gets the task-id as parameter.

To use a java-application as frontend you could also query for specific user-tasks or model as external-service-tasks and query for them.

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thank you very much !
i’m new, i’ll try !

there is some guide that explaine to mo both method ??