Identity v3
Requires: OS-OAUTH1 extension
Authorize a request token
os request token authorize
    --request-key <consumer-key>
    --role <role>
Request token to authorize (ID only) (required)
Roles to authorize (name or ID) (repeat to set multiple values) (required)
Create a request token
os request token create
    --consumer-key <consumer-key>
    --consumer-secret <consumer-secret>
    --project <project>
    [--domain <domain>]
Consumer key (required)
Consumer secret (required)
Project that consumer wants to access (name or ID) (required)
Domain owning <project> (name or ID)