Authenticates the client into Connect.

• Payload: * Success: Returns a token. This token is needed to make all subsequent calls to the service.
• Failure: Any other response
• Note: This endpoint is actually making reference to the POST /auth from the Auth service endpoint; but being so relevant to OAPI, that it has been included here. You will note here that /auth is an internal server redirection to the proper /ordering endpoint in the Auth service.