The access token you receive will be relatively short-lived (default 24 hours). Once an access token has expired you can use your refresh token to generate a new access token. Refresh tokens never expire, however they are one-time use only — your request for a new access token will also return a new refresh token.
Secret of your application, provided when you register a confidential client in API settings. Confidential clients only — public clients must not send this.
refresh_tokenstring·required
Your refresh token.
grant_typestring·required
The literal string "refresh_token".Example: refresh_token
