Hello, tell me please can I add a Contact via the API that will be visible to everyone?
This post should answer your question:
Yes, there is an address book API in beta it seems which can support this feature. Since this is a Beta API, you would need to send an email to the developer support team requesting them to join or even can join this beta program if you are interested by submitting a help ticket.
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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