To respond to the SIGN_ON_REQUIRED flow state, the user initiates the user.lookup action. The flow service calls the POST /{{envID}}/flows/{{flowID}} endpoint operation and uses the application/vnd.pingidentity.user.lookup+json custom media type in the Content-type HTTP request header to identify the action.

The request body requires the username property, which specifies the name to use for the lookup action. In this workflow, if the user.lookup action completes successfully, the flow proceeds to the next sign-on policy action. The flow status value of OTP_REQUIRED requires a one-time password verification.

The response includes a HAL link for the otp.check action as an option for this flow. This option is available because the sign-on policy includes the MULTIFACTOR_AUTHENTICATION policy action to prompt the user to complete an MFA action.