v0 and Sage Pay integration: Step-by-Step Guide 2025

 

Preparing Your Project Dependencies

 

Begin by updating your project’s package.json file to include the necessary dependencies. Since your v0 project does not offer a terminal, manually add the following dependency definitions in your package.json file to install packages such as express, axios, and types for express.

{
  "dependencies": {
    "axios": "^0.21.1",
    "express": "^4.17.1"
  },
  "devDependencies": {
    "typescript": "^4.0.3",
    "@types/express": "^4.17.8"
  }
}

 

Configuring Sage Pay Credentials

 

Create a new file named config.ts inside your src folder. This file will hold your Sage Pay configuration details such as the endpoint URL and your encoded API key. Update these values with your actual Sage Pay account information.

// File: src/config.ts
export const SAGEPAYCONFIG = {
  endpoint: 'https://test.sagepay.com/api/v1', // Use the appropriate endpoint (test or live)
  apiKey: 'YOURENCODEDAPI_KEY' // Replace with your actual encoded API key
};

 

Creating the Sage Pay Integration Module

 

Next, create a new file named sagepay.ts in your src directory. This module will contain the functions necessary to communicate with Sage Pay. In this example, we include a function to initiate a payment. Adjust the payload and endpoint path as required by Sage Pay’s API documentation.

import axios from 'axios';
import { SAGEPAYCONFIG } from './config';

export interface SagePayResponse {
  status: string;
  message: string;
  transactionId?: string;
}

export async function initiatePayment(amount: number, currency: string, vendorTxCode: string): Promise<SagePayResponse> {
  try {
    const payload = {
      amount: amount,
      currency: currency,
      vendorTxCode: vendorTxCode
      // Include additional fields as required by Sage Pay API documentation
    };
    
    const response = await axios.post(
      ${SAGE_PAY_CONFIG.endpoint}/payments, 
      payload, 
      {
        headers: {
          'Content-Type': 'application/json',
          'Authorization': Basic ${SAGE_PAY_CONFIG.apiKey}
        }
      }
    );
    
    return response.data;
  } catch (error: any) {
    return {
      status: 'error',
      message: error.response?.data.message || 'Payment initiation failed'
    };
  }
}

 

Integrating the Sage Pay Module into Your Application

 

Assuming your main application file is named app.ts (located in the src folder), import and integrate the Sage Pay module by creating a new route to handle payment requests. This endpoint will accept payment details, call the initiatePayment function, and return the response to the client.

import express from 'express';
import { initiatePayment } from './sagepay';

const app = express();
app.use(express.json());

app.post('/api/payments', async (req, res) => {
  // Extract the required payment details from the request body
  const { amount, currency, vendorTxCode } = req.body;

  // Call the Sage Pay integration function to initiate the payment
  const result = await initiatePayment(amount, currency, vendorTxCode);
  
  // Return the response received from Sage Pay
  res.json(result);
});

const PORT = process.env.PORT || 3000;
app.listen(PORT, () => {
  console.log(Server running on port ${PORT});
});

 

Finalizing and Running Your Application

 

After adding the above code files and modifications, save all your changes. Since your v0 project does not have a terminal, ensure that your build process automatically compiles the TypeScript code and starts your application. Typically, your project’s main entry point (app.ts) will be compiled to JavaScript and run by your hosting environment.

With the integration complete:

// Example request body for testing the payment endpoint
{
  "amount": 100.00,
  "currency": "GBP",
  "vendorTxCode": "uniquetransactioncode_123"
}

Your new payment endpoint (/api/payments) is now ready to be used by client applications to initiate payments via Sage Pay. Make sure to review Sage Pay’s API documentation to include all necessary fields and error handling as needed.