public PaymentCodeDTO GetPaymentCode(UserAccount user)
{
DateTime currentTime = DateTime.UtcNow;
string paymentCode = $"{Constant.PAYMENT_CODE_PREFIX}{string.Concat(HMACSHA512.Generate15(user.SecretKey, currentTime).Skip(1))}";
var result = new PaymentCodeDTO
{
PaymentCode = paymentCode,
ExpireTimestamp = currentTime.AddMinutes(Constant.PAYMENT_CODE_EXPIRE_MINUTE).ToUnixTime().ToString(),
UserId = user.Id
};
RedisHelper.StringSet(
Constant.REDIS_PAYMENT_CODE_DBINDEX,
$"{Constant.REDIS_PAYMENT_CODE_PREFIX}{paymentCode}",
JsonConvert.SerializeObject(result),
TimeSpan.FromMinutes(Constant.PAYMENT_CODE_EXPIRE_MINUTE));
return(result);
}