post {protocol}://{server}{basePath}/protocol/openid-connect/token
Generate an access token to make API calls to Avaya Infinity™.
The access token is valid for a period of time specified in the
expires_in field of the response (usually 900 seconds (15 minutes)).
The access token is a JSON Web Token (JWT) and can be decoded to
get the actual expiry time (in seconds since epoch) from the exp claim.