I using Ringcentral.Client in .Net, when I authorize, I get refresh token and access token. I using refresh token to get new access token. I work very nice but after 2 hours I can't send any message and I get exception
401 (Unauthorized): POST https://platform.devtest.ringcentral.com/restapi/v1.0/account/~/extension/~/sms
But I still recieve event message inbound from another user send to me in method subciption instant message.
I don't understand that. In document, I see refresh token exprire time is 7days, can you explain me about that ?