Automated update of the process without clicking "Start Process" just make put request on the service

Hello everyone,
I have small spring boot project combined with camunda-ee.
How it is at the moment:
At the moment how it works is, when I call a service “HUB” and the service update object B in the DB then I trigger manually from the “task list” in Camunda then I click start process and I am retrieving the data from the DB and it this way it is working.
How I want it to be:
I want to call the service “HUB” with PUT request and without pulling anything from the DB I want to get the message and directly use the information of this message for Camunda and Camunda will display the result without manually clicking the “start process”. Everything automated. I did not find anything that suits for me, any ideas or hints?

I think you’re going to need to clarify several details before anyone can help you.

I want to call the service “HUB” with PUT request

What kind of service are we talking about? Is this modeled in Camunda? External to Camunda?

without pulling anything from the DB I want to get the message

What message?

Camunda will display the result without manually clicking the “start process”.

What result? Displayed where?

It may also help to illustrate a small example in some fashion, maybe even post an example.