It would be very helpful if someone could post a clear explanation for setting up the SMS setting on Erpnext.
This has been helpful for Twilio: Twilio Integration With Frappe Framework | Avil Page
The equivalent of the parameters from the above tutorial in Postman looks like this:
I suggest you achieve a successful SMS message send in Postman or bruno, and then match the relevant parameters with the SMS Settings in Frappe.
In the case of the above: