Need the Endpoints to trigger the OTP and Verify the OTP via CUSTOM CODE

Question

Hi ,

We are trying to integrate the passwordless authentication mechanism in our current system. I have create the User Flow and have tested it as wellm which seems to be working fine.
As of the next step, what I am trying to achieve is get the endpoints that are responsible for sending and verifying the OTP sent to the end user's email/phone instead of using Microsoft's native login page.
Can somebody help with the same or possibly the request that has to be made using the Postman to send the OTP to the phone and then verify the same to get the respective user's token?