Used when either requesting a client grant or an anonymous customer access token: https://docs.commercetools.com/api/authorization#client-credentials-flow https://docs.commercetools.com/api/authorization#tokens-for-anonymous-sessions
Used when attempting to login a customer: https://docs.commercetools.com/api/authorization#password-flow
Used when refreshing any existing access token (whether client or customer): https://docs.commercetools.com/api/authorization#refresh-token-flow
Authentication grant types. These are used when populating the 'grant_type' parameter.