I need someone to help me with a power automate function - 3 forms, 1 list and 1 approval provess

I have to setup a refund approval process. Clients are sent a refund form and then complete it. When refund form is completed a trigger will setoff an internal form to film in by enployees on amounts to be refunded. Once all this data is caotured it needs to be populated into a list.

Then list info is sent for approval, depending on approval condition, the list is updated to accepted or rejected and the final amounts are sent through to finance.

Each refund application needs a special case code