This API Reference document should provide the full URL for generating a RingOut:
https://developers.ringcentral.com/api-reference/RingOut/createRingOutCall

As for the full URL for retrieving a token... there are two resources I would direct you to. First is our RingOut QuickStart:

https://developers.ringcentral.com/guide/voice/quick-start/node

Using this Quick Start you could write a program that uses Password Auth to generate a RingOut. A trace will give you all the API Calls needed.

The API Reference will break this down in more detail:
https://developers.ringcentral.com/api-reference/Get-Token

The full URL will be (for production):
https://platform.ringcentral.com/restapi/oauth/token

---

I post this:

https://platform.devtest.ringcentral.com/restapi/oauth/token

and I get this:

{

"errorCode": "AGW-404",

"message": "Resource not found",

"errors": []

}

What am I doing wrong?

(Note: I'm using both the "Try It" button in the RingCentral instructional webpage, as well as the "Postman" app. Both give the same result.

---