The authentication token (auth token) issued for access to our APIs expires after one hour. To continue accessing our APIs beyond this hour, you can obtain a new access token by using the 'refresh_token' issued to you.
The refresh token should be used with '/oauth/token' call, which returns a new auth token.
Here is an example of how to refresh an expired token using the command line tool 'curl':
curl --request POST \
'https://api.monotype.com/v1/oauth/token' \
--header 'Accept: application/json' \
--header 'Content-Type: application/x-www-form-urlencoded' \
--data 'grant_type=refresh_token&refresh_token=<refresh_token_value>' \
--compressed