Asking for a PIN

I've read through all the documentation and can't seem to piece together the process flow to get the following to occur.

Apple/Microsoft/others require a PIN to speak to a human. I'm looking to implement the same logic.

Basically when you press 1 off of the main line a question would ask to input a PIN. From reading the documentation (I think) I would set up a call router so it appears in the drop-down. When it is activated (i.e. someone calls in) dialpad would reach out to us and get a PIN and an "ask" question (voice to text). If the PIN is correct then they would be allowed to reach the "Support Team".

I just need to know the basic process flow (JSON packets) needed? The documentation shows all the pieces in detail but not how to build anything.

Thanks.