Every Tyro Connect API call requires authentication. Which method you use depends on your integration.
There are 2 ways to integrate with Tyro Connect, and choosing the best way for you depends on the type of infrastructure you have deployed. There are 2 types of infrastructure that Tyro Connect supports:
If you are implementing a POS Cloud Connection you are required to use client credentials authentication.

If you are implementing a POS Instance Connection you are required to use device code authentication.
