-In [Create branching in user journey by using Azure AD B2C custom policies](custom-policies-series-branch-user-journey.md), users who select *Personal Account* need to provide a valid invitation access code to proceed. We use a static access code, but real world apps don't work this way. If the service that issues the access codes is external to your custom policy, you must make a call to that service, and pass the access code input by the user for validation. If the access code is valid, the service returns an HTTP `200 OK` response, and Azure AD B2C issues JWT token. Otherwise, the service returns an HTTP 4xx response, and the user must reenter an access code.
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