marco.pms.api/Marco.Pms.Services/Helpers/PaymentHelper.cs

using Marco.Pms.Model.Employees;
using Marco.Pms.Model.ViewModels.PaymentGetway;
using Razorpay.Api;
using System.Security.Cryptography;
using System.Text;

namespace Marco.Pms.Services.Helpers
{
    public class PaymentHelper
    {
        private readonly IConfiguration _configuration;
        private readonly string key = "YOUR_RAZORPAY_KEY";
        private readonly string secret = "YOUR_RAZORPAY_SECRET";
        public PaymentHelper(IConfiguration configuration)
        {
            _configuration = configuration;
            key = configuration["Razorpay:Key"] ?? "";
            secret = configuration["Razorpay:Secret"] ?? "";
        }

        public CreateOrderVM CreateOrder(double amount, Employee loggedInEmployee, Guid tenantId)
        {
            RazorpayClient client = new RazorpayClient(key, secret);

            var receipt = $"rec_{Guid.NewGuid()}";
            var length = receipt.Length;

            Dictionary<string, object> options = new Dictionary<string, object>
            {
                { "amount", amount * 100 }, // amount in paise
                { "currency", "INR" },
                { "receipt",  receipt},
                { "payment_capture", 1 }
            };

            Order order = client.Order.Create(options);
            var response = new CreateOrderVM
            {
                OrderId = order["id"],
                Key = key
            };
            return response;
        }

        public string GetExpectedSignature(string payload)
        {
            string expectedSignature;
            using (var hmac = new HMACSHA256(Encoding.UTF8.GetBytes(secret)))
            {
                var hash = hmac.ComputeHash(Encoding.UTF8.GetBytes(payload));
                expectedSignature = Convert.ToHexString(hash).ToLower();
            }

            return expectedSignature;
        }
    }
}