post https://api.signifyd.com/v3/accounts/events/signups
Record a Signup attempt in the Signifyd system. This event should be instrumented each time a user attempts to Signup to your system. The call to Signifyd should come after the sign up event and the account was already created on your system. All Signup attempts should be recorded. Signifyd will return a response indicating if the user should be allowed to proceed with the Signup.