SMS Gateway setup

Hi, I have SMS Gateway/ API that I have created, is there any guide where I could set it up on the server side so that I would be able to receive notification via SMS

Only SMPP protocol is supported for SMS gateway integration. More info on configuration:

https://www.traccar.org/documentation/notifications/

I see, is there any way that I could just call my API incase of an event?
Example use case:

Vehicle 1 entered geofence.
Server will call my API so that it could trigger my SMS alert

Yes, you can always change back-end code to use your API. Source code is available.

Okay thanks!