public async Task SendVerificationCodeAsync(int userId, string phoneNumber)
{
var verificationCode = StringUtility.RandomNumbers(length: 6);
var record = new PhoneNumberVerificationRecord
{
UserId = userId,
Code = verificationCode,
Expires = _clock.Now.UtcDateTime.AddMinutes(15),
PhoneNumber = phoneNumber
};
_verificationCodeRecordRepo.Save(record);
await _smsSender.SendVerificationCodeAsync(phoneNumber, verificationCode);
}