Java integration
curl \ -H "Authorization: $API_KEY" \ http://portal.sso.us-east-1.amazonaws.com/assignment/accounts#x-amz-sso_bearer_token
curl \ -H "Authorization: $API_KEY" \ http://portal.sso.us-east-1.amazonaws.com/assignment/roles#x-amz-sso_bearer_token&account_id
curl \ -H "Authorization: $API_KEY" \ http://portal.sso.us-east-1.amazonaws.com/federation/credentials#role_name&account_id&x-amz-sso_bearer_token