init commit over here

src/MistoxWebsite.Server/Controllers/PaymentController.cs

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+using Microsoft.AspNetCore.Cors;
+using Microsoft.AspNetCore.Mvc;
+using MistoxWebsite.Server.Services.DatabaseService;
+using MistoxWebsite.Shared;
+using Newtonsoft.Json;
+using Stripe;
+using Stripe.Climate;
+using Stripe.Tax;
+
+namespace MistoxWebsite.Server.Controllers {
+    [ApiController]
+    public class PaymentController : ControllerBase {
+
+        DatabaseService _databaseService;
+
+        public PaymentController( DatabaseService databaseService ) {
+            _databaseService = databaseService;
+        }
+
+        // Charges
+        [Route( "api/getCheckoutToken" )]
+        [HttpPost]
+        public async Task<string> GetPaymentKey( [FromQuery] string userID ) {
+
+            // Stored Variables
+            string OrderNumber = Guid.NewGuid().ToString().Substring(0,10);
+            int subtotal = 0;
+
+            // Get the user purchasing the items
+            string UserID = "";
+            Shared.Account? acc = await _databaseService.GetAccount(userID);
+            if( acc != null ) {
+                UserID = acc.ID.ToString();
+                List<Cart> cart = await _databaseService.GetCart( acc );
+
+                // build Recipt and calculate Tax
+                var options = new CalculationCreateOptions{
+                    Currency = "usd",
+                    CustomerDetails = new CalculationCustomerDetailsOptions{
+                        AddressSource = "billing",
+                    },
+                    Expand = new List<string>(){ "line_items" },
+                    LineItems = new List<CalculationLineItemOptions>()
+                };
+
+                List<int> prods = new List<int>();
+
+                // Add items to receipt
+                foreach( Cart items in cart ) {
+                    Shared.Product? product = await _databaseService.GetProduct( items.ProductID );
+                    if (product != null){
+                        prods.Add(product.ID);
+                        if( product != null ) {
+                            subtotal += product.Cost;
+                            options.LineItems.Add( new CalculationLineItemOptions {
+                                Amount = product.Cost,
+                                TaxCode = "txcd_10201000",          // Tax code for downloadable digital games
+                                Quantity = 1,
+                                Reference = product.Name,
+                                TaxBehavior = "exclusive"
+                            } );
+                        }
+                    }
+                   
+                }
+
+                var service = new CalculationService();
+                Calculation result = service.Create( options );
+
+                string csv = "";
+                foreach (int cur in prods ) {
+                    csv = csv + cur + ",";
+                }
+
+                // Crate Payment Intent
+                PaymentIntentCreateOptions paymentIntent = new PaymentIntentCreateOptions(){
+                    Amount = result.AmountTotal,
+                    Currency = "usd",
+                    Metadata = new Dictionary<string, string> {
+                        { "ordernumber", OrderNumber },
+                        { "user", UserID },
+                        { "products", csv },
+                        { "subtotal", subtotal.ToString() },
+                        { "total", result.AmountTotal.ToString() }
+                    },
+                    StatementDescriptor = "Mistox.Net #" + OrderNumber
+                };
+
+                PaymentIntentService intentService = new PaymentIntentService();
+                PaymentIntent x = await intentService.CreateAsync( paymentIntent );
+                return x.ClientSecret;
+            }
+            return "0";
+        }
+
+        [Route( "/api/payment/response" )]
+        [HttpPost]
+        public async Task<IActionResult> paymentWebhook() {
+            try {
+                const string endpointSecret = "whsec_HCO7uv2BPIPmUPOiSg9tfwLZul8usCGG";
+                string body = await new StreamReader(Request.Body).ReadToEndAsync();
+                Event e = EventUtility.ConstructEvent( body, Request.Headers["Stripe-Signature"], endpointSecret );
+                if( e.Type == "payment_intent.succeeded" ) {
+
+                    // Extract Data from payment confirm
+                    PaymentIntent intent = (PaymentIntent)e.Data.Object;
+                    string orderNumber = "";
+                    int userID = 0;
+                    List<int> productIDs = new List<int>();
+                    int subtotal = 0;
+                    int total = 0;
+
+                    KeyValuePair<string, string>[] y = intent.Metadata.ToArray();
+                    foreach( KeyValuePair<string, string> cur in y ) {
+                        string val = cur.Key;
+                        if( val == "ordernumber" ) {
+                            orderNumber = cur.Value;
+                        } else if( val == "user" ) {
+                            userID = int.Parse( cur.Value );
+                        } else if( val == "products" ) {
+                            string[] products = cur.Value.Split(',');
+                            foreach( string product in products ) {
+                                if ( !string.IsNullOrEmpty(product) ) {
+                                    productIDs.Add( Convert.ToInt32( product ) );
+                                }
+                            }
+                        } else if( val == "subtotal" ) {
+                            subtotal = int.Parse( cur.Value );
+                        } else if( val == "total" ) {
+                            total = int.Parse( cur.Value );
+                        }
+                    }
+
+                    // Clear the cart
+                    Shared.Account account = new Shared.Account{
+                        ID = userID
+                    };
+                    await _databaseService.ClearCart( account );
+
+                    // Add data to misox receipt
+                    for( int i = 0; i < productIDs.Count; i++ ) {
+                        int product = productIDs[i];
+                        await _databaseService.NewReceipt( new Receipt {
+                            AccountID = userID,
+                            ProductID = product,
+                            ReceiptID = orderNumber,
+                            Time = DateTime.Now,
+                            TaxAmount = total - subtotal,
+                            TotalCost = total,
+                            LineItem = i
+                        } );
+                    }
+                } else {
+                    Console.WriteLine( "Unhandled event type: {0}", e.Type );
+                }
+                return Ok();
+            } catch( Exception ex ) {
+                return Content(ex.ToString());
+            }
+        }
+
+    }
+
+}
+