QRBee/QRBee.Core/Data/MerchantToClientRequest.cs

using System.Globalization;

namespace QRBee.Core.Data
{
    public record MerchantToClientRequest
    {
        public string MerchantId { get; set; }

        public string MerchantTransactionId { get; set; }

        public string Name { get; set; }

        public decimal Amount { get; set; }

        public DateTime TimeStampUTC { get; set; }

        public string MerchantSignature { get; set; }

        /// <summary>
        /// Convert MerchantToClientRequest to string to be used as QR Code source (along with merchant signature)
        /// </summary>
        /// <returns>String conversion</returns>
        public string AsQRCodeString() => $"{AsDataForSignature()}|{MerchantSignature}";

        public string AsDataForSignature() => $"{MerchantId}|{MerchantTransactionId}|{Name}|{Amount.ToString("0.00", CultureInfo.InvariantCulture)}|{TimeStampUTC:O}";

        /// <summary>
        /// Convert from string
        /// </summary>
        /// <param name="input"> A string representation of MerchantToClientRequest</param>
        /// <returns> Converted string</returns>
        /// <exception cref="ApplicationException">Thrown if the input string is incorrect</exception>
        public static MerchantToClientRequest FromString(string input)
        {
            var s = input.Split('|');
            if (s.Length < 6)
            {
                throw new ApplicationException($"Expected 6 elements but got {s.Length}");
            }

            var res = new MerchantToClientRequest
            {
                MerchantId = s[0],
                MerchantTransactionId = s[1],
                Name = s[2],
                Amount = Convert.ToDecimal(s[3], CultureInfo.InvariantCulture),
                TimeStampUTC = DateTime.ParseExact(s[4],"O",null),
                MerchantSignature = s[5]
            };


            return res;
        }

    }
}