def generate_challenge(self):
code = generate_mfa_code(bin_key=self.bin_key)
if self.method == 'sms':
send_sms(self.phone_number, code)
elif self.method == 'voice':
make_call(self.phone_number, code)
def _sms_challenge(self):
"""Executes the SMS challenge."""
code = generate_mfa_code(bin_key=self.secret_key)
send_sms(self.phone_number, code)
