Initiate a verification transaction.

Initiate a verification transaction that is associated with an authenticator registration.

The transaction specifies the authentication methods that the user must complete. This request creates a transaction and sends a push notification to the associated authenticator.

The transaction will remain in a PENDING state until one or more of the following conditions occur:
- All or one of the requested authentication methods is successfully validated based on the transaction logic.
- One or none of the requested authentication methods fails the validation based on the transaction logic.
- The transaction is denied for any reason.
- The transaction is canceled.
- The transaction expires.

Entitlements:
- authnAnyUser (Authenticate any user)
- authn (Authenticate self)