Creating Payment Checkout scenario

modules/payment/src/Payment.Application.Contracts/PaymentRequests/IPaymentRequestAppService.cs

@@ -7,7 +7,7 @@ namespace Payment.PaymentRequests
     public interface IPaymentRequestAppService : IApplicationService
     {
         Task<PaymentRequestDto> GetAsync(Guid id);
-        
+
         Task<PaymentRequestDto> CreateAsync(PaymentRequestCreationDto input);
     }
 }

modules/payment/src/Payment.Application.Contracts/PaymentRequests/PaymentRequestCreationDto.cs

@@ -1,3 +1,4 @@
+using JetBrains.Annotations;
 using System.ComponentModel.DataAnnotations;
 using Volo.Abp.ObjectExtending;
 
@@ -6,12 +7,20 @@ namespace Payment.PaymentRequests
     public class PaymentRequestCreationDto : ExtensibleObject
     {
         public string CustomerId { get; set; }
-        
+
         public string ProductId { get; set; }
-        
+
         [Required]
         public string ProductName { get; set; }
-        
-        public decimal Amount { get; set; }
+
+        public decimal Price { get; set; }
+
+        /// <summary>
+        /// 3 Letter Language Code in ISO 4217 Standards.
+        /// For example: USD, EUR.
+        /// </summary>
+        [StringLength(3)]
+        [CanBeNull]
+        public string Currency { get; set; }
     }
 }

modules/payment/src/Payment.Application.Contracts/PaymentRequests/PaymentRequestDto.cs

@@ -6,13 +6,15 @@ namespace Payment.PaymentRequests
     public class PaymentRequestDto : CreationAuditedEntityDto<Guid>
     {
         public string CustomerId { get; set; }
-        
+
         public string ProductId { get; set; }
-        
+
         public string ProductName { get; set; }
-        
-        public decimal Amount { get; set; }
-        
+
+        public decimal Price { get; set; }
+
+        public string Currency { get; set; }
+
         public PaymentRequestState State { get; set; }
     }
 }

modules/payment/src/Payment.Application/PaymentRequests/PaymentRequestAppService.cs

@@ -1,4 +1,5 @@
-using System;
+using Microsoft.Extensions.Options;
+using System;
 using System.Threading.Tasks;
 
 namespace Payment.PaymentRequests
@@ -6,16 +7,20 @@ namespace Payment.PaymentRequests
     public class PaymentRequestAppService : PaymentAppService, IPaymentRequestAppService
     {
         private readonly IPaymentRequestRepository _paymentRequestRepository;
+        private readonly PaymentOptions _paymentOptions;
 
-        public PaymentRequestAppService(IPaymentRequestRepository paymentRequestRepository)
+        public PaymentRequestAppService(
+            IPaymentRequestRepository paymentRequestRepository,
+            IOptions<PaymentOptions> paymentOptions)
         {
             _paymentRequestRepository = paymentRequestRepository;
+            _paymentOptions = paymentOptions.Value;
         }
 
         public async Task<PaymentRequestDto> GetAsync(Guid id)
         {
             var paymentRequest = await _paymentRequestRepository.GetAsync(id);
-            
+         
             return ObjectMapper.Map<PaymentRequest, PaymentRequestDto>(paymentRequest);
         }
 
@@ -26,7 +31,8 @@ namespace Payment.PaymentRequests
                 input.CustomerId,
                 input.ProductId,
                 input.ProductName,
-                input.Amount
+                input.Price,
+                input.Currency ?? _paymentOptions.DefaultCurrency
             );
 
             await _paymentRequestRepository.InsertAsync(paymentRequest);

modules/payment/src/Payment.BackgroundServices/FodyWeavers.xml

@@ -0,0 +1,3 @@
+<Weavers xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="FodyWeavers.xsd">
+  <ConfigureAwait />
+</Weavers>

modules/payment/src/Payment.BackgroundServices/FodyWeavers.xsd

@@ -0,0 +1,30 @@
+<?xml version="1.0" encoding="utf-8"?>
+<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema">
+  <!-- This file was generated by Fody. Manual changes to this file will be lost when your project is rebuilt. -->
+  <xs:element name="Weavers">
+    <xs:complexType>
+      <xs:all>
+        <xs:element name="ConfigureAwait" minOccurs="0" maxOccurs="1">
+          <xs:complexType>
+            <xs:attribute name="ContinueOnCapturedContext" type="xs:boolean" />
+          </xs:complexType>
+        </xs:element>
+      </xs:all>
+      <xs:attribute name="VerifyAssembly" type="xs:boolean">
+        <xs:annotation>
+          <xs:documentation>'true' to run assembly verification (PEVerify) on the target assembly after all weavers have been executed.</xs:documentation>
+        </xs:annotation>
+      </xs:attribute>
+      <xs:attribute name="VerifyIgnoreCodes" type="xs:string">
+        <xs:annotation>
+          <xs:documentation>A comma-separated list of error codes that can be safely ignored in assembly verification.</xs:documentation>
+        </xs:annotation>
+      </xs:attribute>
+      <xs:attribute name="GenerateXsd" type="xs:boolean">
+        <xs:annotation>
+          <xs:documentation>'false' to turn off automatic generation of the XML Schema file.</xs:documentation>
+        </xs:annotation>
+      </xs:attribute>
+    </xs:complexType>
+  </xs:element>
+</xs:schema>

modules/payment/src/Payment.Domain/PayPal/PayPalConsts.cs

@@ -0,0 +1,18 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Payment.PayPal
+{
+    public static class PayPalConsts
+    {
+        public static class Environment
+        {
+            public const string Sandbox = "Sandbox";
+
+            public const string Live = "Live";
+        }
+    }
+}

modules/payment/src/Payment.Domain/PayPal/PayPalOptions.cs

@@ -0,0 +1,22 @@
+using System.Collections.Generic;
+
+namespace Payment.PayPal
+{
+    public class PayPalOptions
+    {
+        public string ClientId { get; set; }
+
+        public string Secret { get; set; }
+
+        public string Locale { get; set; }
+
+        /// <summary>
+        /// "Sandbox" or "Live". Default value is "Sandbox"
+        /// </summary>
+        public string Environment { get; set; } = PayPalConsts.Environment.Sandbox;
+
+        public bool Recommended { get; set; }
+
+        public List<string> ExtraInfos { get; set; } = new();
+    }
+}

modules/payment/src/Payment.Domain/PaymentDomainModule.cs

@@ -1,4 +1,6 @@
-using Volo.Abp.Domain;
+using Microsoft.Extensions.DependencyInjection;
+using Payment.PayPal;
+using Volo.Abp.Domain;
 using Volo.Abp.Modularity;
 
 namespace Payment
@@ -9,6 +11,12 @@ namespace Payment
     )]
     public class PaymentDomainModule : AbpModule
     {
+        public override void ConfigureServices(ServiceConfigurationContext context)
+        {
+            var configuration = context.Services.GetConfiguration();
 
+            Configure<PayPalOptions>(configuration.GetSection("Payment:PayPal"));
+            Configure<PaymentOptions>(configuration.GetSection("Payment"));
+        }
     }
 }

modules/payment/src/Payment.Domain/PaymentOptions.cs

@@ -0,0 +1,7 @@
+namespace Payment
+{
+    public class PaymentOptions
+    {
+        public string DefaultCurrency { get; set; }
+    }
+}

modules/payment/src/Payment.Domain/PaymentRequests/PaymentRequest.cs

@@ -9,14 +9,16 @@ namespace Payment.PaymentRequests
     {
         [CanBeNull]
         public string CustomerId { get; private set; }
-        
+
         [CanBeNull]
         public string ProductId { get; private set; }
-        
+
         [NotNull]
         public string ProductName { get; private set; }
-        
-        public decimal Amount { get; private set; }
+
+        public decimal Price { get; private set; }
+
+        public string Currency { get; private set; }
 
         public PaymentRequestState State { get; set; }
 
@@ -24,7 +26,7 @@ namespace Payment.PaymentRequests
 
         private PaymentRequest()
         {
-            
+
         }
 
         public PaymentRequest(
@@ -32,13 +34,15 @@ namespace Payment.PaymentRequests
             [CanBeNull] string customerId,
             [CanBeNull] string productId,
             [NotNull] string productName,
-            decimal amount) 
+            decimal price,
+            [NotNull] string currency)
             : base(id)
         {
             CustomerId = customerId;
             ProductId = productId;
             ProductName = Check.NotNullOrWhiteSpace(productName, nameof(productName));
-            Amount = amount;
+            Price = price;
+            Currency = currency;
         }
     }
 }

modules/payment/src/Payment.Web/Pages/Payment/Checkout.cshtml

@@ -1,9 +1,7 @@
 @page
-@using Microsoft.Extensions.Localization
-@using Payment.Localization
 @using Payment.Web.Pages.Payment
+@inherits Payment.Web.Pages.PaymentPageBase
 @model Payment.Web.Pages.Payment.CheckoutPageModel
-@inject IStringLocalizer<PaymentResource> L
 
 @section scripts {
     <abp-script-bundle name="@typeof(CheckoutPageModel).FullName">
@@ -20,7 +18,7 @@
     <abp-card-body>
         <ul>
             <li>Product name: @Model.PaymentRequest.ProductName</li>
-            <li>Amount: @Model.PaymentRequest.Amount</li>
+            <li>Amount: @Model.PaymentRequest.Price</li>
         </ul>
     </abp-card-body>
 </abp-card>

modules/payment/src/Payment.Web/Pages/Payment/Checkout.cshtml.cs

@@ -1,7 +1,14 @@
 using System;
+using System.Collections.Generic;
+using System.Linq;
 using System.Threading.Tasks;
 using Microsoft.AspNetCore.Mvc;
+using Microsoft.Extensions.Options;
+using NUglify.Helpers;
 using Payment.PaymentRequests;
+using Payment.Web.PaymentRequest;
+using PayPalCheckoutSdk.Core;
+using PayPalCheckoutSdk.Orders;
 
 namespace Payment.Web.Pages.Payment
 {
@@ -13,10 +20,17 @@ namespace Payment.Web.Pages.Payment
         public PaymentRequestDto PaymentRequest { get; set; }
 
         private readonly IPaymentRequestAppService _paymentRequestAppService;
+        private readonly IPaymentUrlBuilder _paymentUrlBuilder;
+        private readonly PayPalHttpClient _payPalHttpClient;
 
-        public CheckoutPageModel(IPaymentRequestAppService paymentRequestAppService)
+        public CheckoutPageModel(
+            IPaymentRequestAppService paymentRequestAppService,
+            IPaymentUrlBuilder paymentUrlBuilder,
+            PayPalHttpClient payPalHttpClient)
         {
             _paymentRequestAppService = paymentRequestAppService;
+            this._paymentUrlBuilder = paymentUrlBuilder;
+            this._payPalHttpClient = payPalHttpClient;
         }
         
         public async Task OnGetAsync()
@@ -28,10 +42,56 @@ namespace Payment.Web.Pages.Payment
         {
             PaymentRequest = await _paymentRequestAppService.GetAsync(PaymentRequestId);
 
-            // TODO: Redirect from here.
+            var order = new OrderRequest
+            {
+                CheckoutPaymentIntent = "CAPTURE",
+                ApplicationContext = new ApplicationContext
+                {
+                    ReturnUrl = _paymentUrlBuilder.BuildReturnUrl(PaymentRequest.Id).AbsoluteUri,
+                    CancelUrl = _paymentUrlBuilder.BuildCheckoutUrl(PaymentRequest.Id).AbsoluteUri,
+                },
+                PurchaseUnits = new List<PurchaseUnitRequest>
+                {
+                    new PurchaseUnitRequest
+                    {
+                        AmountWithBreakdown = new AmountWithBreakdown
+                        {
+                            AmountBreakdown = new AmountBreakdown
+                            {
+                                ItemTotal = new Money
+                                {
+                                    CurrencyCode = PaymentRequest.Currency,
+                                    Value = PaymentRequest.Price.ToString(".00")
+                                }
+                            },
+                            CurrencyCode = PaymentRequest.Currency,
+                            Value = PaymentRequest.Price.ToString(".00"),
+                        },
+                        Items = new List<Item>
+                        {
+                            new Item
+                            {
+                                Quantity = 1.ToString(),
+                                Name = PaymentRequest.ProductName,
+                                UnitAmount = new Money
+                                {
+                                    CurrencyCode = PaymentRequest.Currency,
+                                    Value = PaymentRequest.Price.ToString(".00")
+                                }
+                            }
+                        },
+                        ReferenceId = PaymentRequest.Id.ToString()
+                    }
+                }
+            };
 
+            var request = new OrdersCreateRequest();
+            request.Prefer("return=representation");
+            request.RequestBody(order);
 
+            var result = (await _payPalHttpClient.Execute(request)).Result<Order>();
 
+            Response.Redirect(result.Links.First(x => x.Rel == "approve").Href);
         }
     }
 }

modules/payment/src/Payment.Web/Pages/Payment/CheckoutCallback.cshtml

@@ -0,0 +1,8 @@
+@page
+@using Payment.Web.Pages.Payment
+@inherits Payment.Web.Pages.PaymentPageBase
+@model Payment.Web.Pages.Payment.CheckoutCallbackModel
+@{
+	PageLayout.Content.Title = L["Redirecting"];
+}
+<p>@L["Redirecting"]</p>

modules/payment/src/Payment.Web/Pages/Payment/CheckoutCallback.cshtml.cs

@@ -0,0 +1,6 @@
+namespace Payment.Web.Pages.Payment
+{
+    public class CheckoutCallbackModel : PaymentPageModel
+    {
+    }
+}

modules/payment/src/Payment.Web/Pages/PaymentPageBase.cs

@@ -0,0 +1,20 @@
+using Microsoft.AspNetCore.Mvc.Razor.Internal;
+using Microsoft.Extensions.Localization;
+using Payment.Localization;
+using System.Threading.Tasks;
+using Volo.Abp.AspNetCore.Mvc.UI.Layout;
+
+namespace Payment.Web.Pages
+{
+    public class PaymentPageBase : Microsoft.AspNetCore.Mvc.RazorPages.Page
+    {
+        [RazorInject] public IStringLocalizer<PaymentResource> L { get; set; }
+
+        [RazorInject] public IPageLayout PageLayout { get; set; }
+
+        public override Task ExecuteAsync()
+        {
+            return Task.CompletedTask; // Will be overriden by razor pages. (.cshtml)
+        }
+    }
+}

modules/payment/src/Payment.Web/Payment.Web.csproj

@@ -12,6 +12,7 @@
   </PropertyGroup>
 
   <ItemGroup>
+    <PackageReference Include="PayPalCheckoutSdk" Version="1.0.4" />
     <PackageReference Include="Volo.Abp.AutoMapper" Version="5.0.0-beta.1" />
     <PackageReference Include="Volo.Abp.AspNetCore.Mvc.UI.Theme.Shared" Version="5.0.0-beta.1" />
   </ItemGroup>

modules/payment/src/Payment.Web/PaymentRequest/IPaymentUrlBuilder.cs

@@ -5,5 +5,7 @@ namespace Payment.Web.PaymentRequest
     public interface IPaymentUrlBuilder
     {
         Uri BuildCheckoutUrl(Guid paymentRequestId);
+
+        Uri BuildReturnUrl(Guid paymentRequestId);
     }
 }

modules/payment/src/Payment.Web/PaymentRequest/PaymentUrlBuilder.cs

@@ -18,5 +18,10 @@ namespace Payment.Web.PaymentRequest
         {
             return new Uri(urlOptions.Applications["MVC"].RootUrl.EnsureEndsWith('/') + "Payment/Checkout?paymentRequestId=" + paymentRequestId);
         }
+
+        public Uri BuildReturnUrl(Guid paymentRequestId)
+        {
+            return new Uri(urlOptions.Applications["MVC"].RootUrl.EnsureEndsWith('/') + "Payment/CheckoutCallback?paymentRequestId=" + paymentRequestId);
+        }
     }
 }

modules/payment/test/Payment.Application.Tests/PaymentRequests/PaymentRequestAppService_Tests.cs

@@ -21,12 +21,12 @@ namespace Payment.PaymentRequests
                 new PaymentRequestCreationDto
                 {
                     ProductName = "My product 1",
-                    Amount = 99.99m
+                    Price = 99.99m
                 }
             );
             
             result.Id.ShouldNotBe(Guid.Empty);
-            result.Amount.ShouldBe(99.99m);
+            result.Price.ShouldBe(99.99m);
             result.ProductName.ShouldBe("My product 1");
         }
     }

src/EventHub.Web/appsettings.json

@@ -7,5 +7,13 @@
     "RequireHttpsMetadata": "true",
     "ClientId": "EventHub_Web",
     "ClientSecret": "1q2w3e*"
+  },
+  "Payment": {
+    "DefaultCurrency": "USD",
+    "PayPal": {
+      "ClientId": "{ClientId}",
+      "Secret": "{Secret}",
+      "Environment": "Sandbox"
+    }
   }
 }