Build a powerapps app that Uses Azure API

Attached is a spreadsheet with a macro. 1. If you type PowerTest in B1 and P0werT3st in B2, it gets a token and 2. It gets a list of models into a dropdown box. 3. Then if you choose a model (choose "test model") and press "get parameters" it gets them and loads them into a form and 4. If you put in the values for the variables and press "Execute" it 5. Returns a value from the black box on Azure. I need: 1. A powerapps application which does these 5 steps 2. Full step by step tutorial, from scratch, on how to put it together. If you can do a video, then indicate that in your proposal.