Token generated in authToken API will be valid for an hour. Post that access_token will automatically expire. When the access_token is expired, there are two options. 1) use the authToken API to generate a new token 2) use refreshToken API to extend the validity of the current token.The refreshed token will also expire after an hour, refer to expires_at in the response for the validity of the token. When the refreshed token also expires, call again the refreshToken API to extend it further. Like wise a token can extended 3 times, refer to refresh_count in the response. After 3 refresh attempts, token will expire and cannot be extended any further. Need to use authToken API to generate a new token.