i have not login with api using ringcentral credential but using demo developer credential it's working so what can i do
http://localhost:8080/demo/callback.html
as the OAuth Redirect URI for your app?
Using the RingCentral Phone for Desktop, you can dial or receive test calls, send and receive test SMS or Fax messages in your sandbox environment.
Download RingCentral Phone for Desktop:
Tip: switch to the "sandbox mode" before logging in the app:
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