Every Tyro Connect API call requires authentication, it depends on your integration which one you should use.
There are 2 ways to integrate with Tyro Connect and choosing what is the best way for you to integrate depends on the type of infrastructure you have deployed. There are 2 types of infrastructure that Tyro Connect supports:
POS Cloud Connection
If you are implementing a POS Cloud Connection you are required to use Client Credentials Authentication.
POS Instance Connection
If you are implementing a POS Instance Connection you are required to use the Device Code Authentication.