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Creating a Custom Payment Gateway

This document explains creating custom a payment gateway that's different than the existing ones in the Payment Module.

Creating Core Operations

  • Create MyPaymentGateway.cs and implement IPaymentGateway

    public class MyPaymentGateway : IPaymentGateway, ITransientDependency
      {
          private readonly IPaymentRequestRepository paymentRequestRepository;
    
          public MyPaymentGateway(IPaymentRequestRepository paymentRequestRepository)
          {
              this.paymentRequestRepository = paymentRequestRepository;
          }
    
          public async Task<PaymentRequestStartResult> StartAsync(PaymentRequest paymentRequest, PaymentRequestStartInput input)
          {
              var totalPrice = paymentRequest.Products.Sum(x => x.TotalPrice);
    
              var checkoutLink = // Some operations here
    
              return new PaymentRequestStartResult
              {
                  CheckoutLink = checkoutLink + "returnUrl=" + input.ReturnUrl
              };
          }
    
          public async Task<PaymentRequest> CompleteAsync(Dictionary<string, string> parameters)
          {
              var token = parameters["token"]; // You can get any parameter from your gateway provides. Example: token, id, hash etc. 
    
              var result = ;// provider.Validate(token); Validate the payment here
    
              var paymentRequest = await paymentRequestRepository.FindAsync(result.Id);
    
              paymentRequest.SetState(PaymentRequestState.Completed); // completed or anything else according to your result.
    
              return paymentRequest;
          }
    
          public Task HandleWebhookAsync(string payload, Dictionary<string, string> headers)
          {
              // You can leave unimplemented if you not configure webhooks.
              throw new System.NotImplementedException();
          }
    
          public bool IsValid(PaymentRequest paymentRequest, Dictionary<string, string> properties)
          {
              // You can check some custom logic here to make this gateway available or not.
              return true;
          }
      }
    
  • You should configure your gateway in PaymentOptions

    Configure<PaymentOptions>(options =>
      {
          options.Gateways.Add(new PaymentGatewayConfiguration(
              "MyGateway",
              LocalizableString.Create<PaymentResource>("MyGateway"),
              isSubscriptionSupported: false,
              typeof(MyPaymentGateway)
              ));
      });
    

Creating the UI

There are 2 types of pages that are supported by default. You can define a pre-payment page and post-payment page.

  • Create PreCheckout.cshtml and PreCheckout.cshtml.cs

    @model PreCheckoutModel
    
    <h3>Pre Checkout</h3>
    <form method="post">
        <button class="btn btn-success" asp-page-handler="ContinueToCheckout">
            Continue to Checkout
            <i class="fa fa-long-arrow-right"></i>
        </button>
    </form>
    
    public class PreCheckoutModel : AbpPageModel
    {
        [BindProperty] public Guid PaymentRequestId { get; set; }
    
        public virtual ActionResult OnGet()
        {
            // GET operation is not supported here. All the selected gateway requests will be sent as POST.
            return BadRequest();
        }
    
        public virtual async Task OnPostAsync()
        {
            // You can get the payment request from the database by using `PaymentRequestId` and render something on the UI side.
        }
    
        public virtual async Task<IActionResult> OnPostContinueToCheckout()
        {
            return Redirect("the-actual-checkout-link-of-gateway");
        }
    }
    
  • Create PostCheckout.cshtml and PostCheckout.cshtml.cs

    @model PostCheckoutModel
    
    <h3>Operation Done</h3>
    
  • Configure your pages in PaymentWebOptions

    Configure<PaymentWebOptions>(options =>
    {
        options.Gateways.Add(new PaymentGatewayWebConfiguration(
            name: "MyGateway",
            prePaymentUrl: "/MyGateway/PreCheckout", // This page will be opened before checkout.
            isSubscriptionSupported: false,
            postPaymentUrl: "/MyGateway/PostCheckout" // This page will be opened after checkout.
            ));
    });
    

Your custom gateway will be listed in the public payment gateway selection page. If there is only one payment gateway, this page will be skipped. ABP Payment Custom Gateway

Contributors


Last updated: April 10, 2023 Edit this page on GitHub

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