请求复刻Sage Line50的Pay Now按钮至Visual Studio应用

Hey there! Let's walk through how to replicate that handy Sage Line50 "Pay Now" functionality in your Visual Studio app, plus share some tips if you're looking for someone to build this out for you.

First, you’ll need to work directly with the Sage Pay API—since that magic payment link relies on encrypted transaction data that Sage Pay’s gateway recognizes. Here’s a breakdown of the key steps:

• Grab your Sage Pay merchant credentials
  Head to your Sage Pay merchant dashboard to get your Vendor ID, API key, and any other required auth details. These are non-negotiable for generating valid, encrypted transaction links.

• Build your transaction data model
  When a user selects a customer record and clicks your custom "Pay Now" button, collect the critical details:

  • Customer identifier (to tie the payment back to their record)
  • Exact payment amount (formatted to 2 decimal places, per Sage Pay’s rules)
  • Currency code (e.g., GBP, USD)
  • Payment description (like "Invoice #123 Payment")
  • Success/failure callback URLs (where Sage Pay sends updates after payment completes)

• Encrypt data and generate the payment link
  Sage Pay requires you to encrypt the transaction data using your API key (the exact method depends on your integration mode—Form Integration is the closest match to your original workflow, since it redirects to Sage’s hosted page). Here’s a simplified C# example (assuming a .NET Visual Studio project):

  // Sample transaction data (customize this with your app's values)
  var transactionFields = new Dictionary<string, string>
  {
      {"Vendor", "YourUniqueMerchantID"},
      {"Amount", "50.00"},
      {"Currency", "GBP"},
      {"Description", "Invoice Payment for John Doe"},
      {"SuccessURL", "https://yourapp.com/payment-confirmed"},
      {"FailureURL", "https://yourapp.com/payment-failed"}
  };
  
  // Use Sage Pay's encryption logic (implement this based on official docs)
  var encryptedPayload = SagePayEncryptionUtility.Encrypt(transactionFields, "YourSagePayAPIKey");
  // Generate the final payment link to send to customers
  var sagePayPaymentLink = $"https://live.sagepay.com/gateway/service/vspform-register.vsp?Crypt={encryptedPayload}";
  

• Add the "Copy Link" functionality
  Pop up a simple form (just like Sage Line50) showing the payment amount, then add a button that copies the generated sagePayPaymentLink to the clipboard. For .NET apps, you can use Clipboard.SetText(sagePayPaymentLink) to handle this easily.

• Handle payment callbacks
  After the customer completes payment on Sage’s page, Sage Pay will POST transaction details to your success/failure URLs. You’ll need to:

  1. Verify the incoming request’s signature to confirm it’s from Sage Pay
  2. Update your app’s customer record to mark the payment as completed (or failed)
  3. Send a confirmation to the customer if needed

If you don’t have the bandwidth or Sage Pay experience to build this yourself:

• Post a job on Stack Overflow Jobs, clearly outlining the requirements: Visual Studio (.NET) app, Sage Pay integration matching the exact Line50 workflow, and whether your app is WinForms, WPF, or ASP.NET.
• Look for developers with prior experience integrating Sage Pay (or similar payment gateways) into accounting systems—they’ll understand the data mapping and security requirements right away.
• Be sure to share the full workflow details (select customer → enter amount → copy link → send email) and any specific app constraints upfront to get accurate quotes.

内容的提问来源于stack exchange，提问作者user2988641