Integration of simplybook.me reservation system with TTlock application

I am requesting a quote for a script to integrate the simplybook.me class booking system and the TTlock remote electronic locks application. Both systems have an open access API.

I would like the integration to work like this:

1. someone makes a reservation in the reservation system

2. the information is sent to the door handle app

3. the app generates a code for the door which works for a certain period of time

4. sends this code to the reservation system

5. the reservation system sends this automatically by email to the customer

In general, sending emails, generating time codes, one-time codes, etc. are functionalities that both systems offer, only thing I want to do is to splice one with the other so that the code is automatically generated in the door handle system when the reservation is made and paid for and sent by email to the customer