Issue a one-time password to verify a beneficiary batch

Starts the verification process for updating the beneficiaries batch in which a one-time password is sent to a device belonging to the logged-in user that was previously enrolled through the /authentication_factors/otp/{channel} endpoint.

You should only start this process if the beneficiary update state is PENDING_CHALLENGE.

Note that on the Sandbox Environment, text messages are not sent and the one-time-password is always "123456".