Book a call with an Expert

Starting a new venture? Need to upgrade your web app? RapidDev builds application with your growth in mind.

How to build Checkout flow with Lovable?

Planning the Lovable Checkout Flow

Make sure you have a Lovable account and your public API key ready.
Decide on the payment amount, currency, and any additional configuration details required for your checkout.
This guide will help you build a checkout flow by using an HTML file for the interface and a JavaScript file for integrating with Lovable’s API.

Configuring Lovable Dependencies

Since Lovable does not have a terminal, you must load its dependencies directly into your code.
Open your HTML file (or create one as instructed in the next step) and insert the following snippet inside the head tag to load the Lovable library:

Creating the Checkout HTML File

Create a new file in your project folder and name it checkout.html.
This file contains the basic structure of your checkout page. Copy and paste the code below into checkout.html:




  
    
    Lovable Checkout
    
    
    
    
  
  
    Checkout Page

Setting Up the Lovable Checkout JavaScript

Create a new file in your project directory named lovable\_checkout.js.
This file will include the JavaScript code that initializes and manages the checkout flow with Lovable.
Paste the following code into lovable\_checkout.js:


// Initialize Lovable Checkout when the document is fully loaded
document.addEventListener("DOMContentLoaded", function() {
  // Define your checkout configuration details
  var checkoutConfig = {
    publicKey: "YOUR_LOVABLE_PUBLIC\_KEY", // Replace with your actual Lovable public key
    amount: 1999,      // Example amount in cents (e.g., 1999 represents $19.99)
    currency: "USD",   // Set your currency code
    containerId: "lovable-checkout-container",  // ID of the container element for the checkout modal
    onSuccess: function(response) {
      // Function to handle successful payments
      console.log("Payment Successful:", response);
      alert("Payment was successful!");
      // You can add additional logic here, such as redirecting the user or updating the UI
    },
    onError: function(error) {
      // Function to handle errors during checkout
      console.error("Payment Error:", error);
      alert("There was an error during payment. Please try again.");
      // You can add additional error handling logic here
    }
  };

  // Attach an event listener to the checkout trigger button
  document.getElementById("start-checkout").addEventListener("click", function() {
    // Start the Lovable checkout process using the provided configuration
    Lovable.startCheckout(checkoutConfig);
  });
});

Customizing and Extending the Checkout Flow

If you need to add custom styling to your checkout modal, create a CSS file (for example, styles.css) in your project and link it within the head tag of checkout.html.
You can also extend the JavaScript functionality in lovable\_checkout.js by handling additional events or adding more detailed logging as needed.

Testing the Checkout Flow

Open the checkout.html file in a web browser.
Click the “Proceed to Payment” button to launch the Lovable checkout modal.
Monitor the browser’s console output to view confirmation messages or any errors that may appear during the payment process.

Finalizing and Deploying Your Checkout Integration

Ensure all your files (checkout.html and lovable\_checkout.js) are saved in your project folder.
If you need to update any configuration details (such as your public key or amount), simply update the lovable\_checkout.js file.
Your checkout flow is now set up for Lovable. Use the live version of checkout.html to test and share your integration.

How to Build a Seamless Checkout Flow with Lovable in Node.js


const express = require('express');
const bodyParser = require('body-parser');
const app = express();

app.use(bodyParser.json());

app.post('/api/checkout', async (req, res) => {
  const { customerId, cartItems, paymentInfo } = req.body;
  
  if (!customerId || !Array.isArray(cartItems) || !paymentInfo) {
    return res.status(400).json({ error: 'Invalid request payload' });
  }
  
  const order = {
    customerId,
    items: cartItems.map(item => ({
      productId: item.id,
      quantity: item.qty,
      price: item.unitPrice,
      total: item.qty \* item.unitPrice
    })),
    payment: {
      method: paymentInfo.method,
      token: paymentInfo.token,
      billingAddress: paymentInfo.billingAddress
    },
    createdAt: new Date(),
    status: 'pending'
  };
  
  try {
    const savedOrder = await saveOrderToDB(order);
    const paymentResponse = await processPaymentWithLovable(order.payment, savedOrder.totalAmount);
    
    if (paymentResponse.success) {
      savedOrder.status = 'completed';
      await updateOrderStatus(savedOrder.id, 'completed');
      return res.status(200).json({ orderId: savedOrder.id, status: savedOrder.status });
    } else {
      savedOrder.status = 'failed';
      await updateOrderStatus(savedOrder.id, 'failed');
      return res.status(402).json({ error: 'Payment failed' });
    }
  } catch (err) {
    return res.status(500).json({ error: 'Internal server error' });
  }
});

async function saveOrderToDB(order) {
  order.id = Math.floor(Math.random() \* 1000000);
  order.totalAmount = order.items.reduce((sum, item) => sum + item.total, 0);
  return new Promise(resolve => setTimeout(() => resolve(order), 100));
}

async function updateOrderStatus(orderId, status) {
  return new Promise(resolve => setTimeout(resolve, 50));
}

async function processPaymentWithLovable(paymentData, amount) {
  return new Promise(resolve => {
    setTimeout(() => {
      resolve({ success: true, transactionId: 'txn\_' + Math.floor(Math.random() \* 1000000) });
    }, 150);
  });
}

app.listen(3000, () => console.log('Server running on port 3000'));

How to Build a Checkout Flow with Lovable Using Node.js Express


const express = require('express');
const fetch = require('node-fetch');
const app = express();

app.use(express.json());

app.post('/api/checkout/external', async (req, res) => {
  try {
    const { customerId, cartItems, promoCode, paymentDetails } = req.body;
    if (!customerId || !Array.isArray(cartItems) || !paymentDetails) {
      return res.status(400).json({ error: 'Missing required fields' });
    }
    
    let totalAmount = cartItems.reduce((total, item) => total + (item.price \* item.quantity), 0);
    if (promoCode === 'DISCOUNT10') {
      totalAmount \*= 0.9;
    }
    
    const orderId = Math.floor(Math.random() \* 1000000);
    const orderPayload = {
      orderId,
      customerId,
      items: cartItems,
      totalAmount,
      paymentDetails
    };

    const paymentResponse = await fetch('https://api.lovable.com/v1/payment/process', {
      method: 'POST',
      headers: {
        'Content-Type': 'application/json',
        'Authorization': 'Bearer YOUR_LOVABLE_API\_KEY'
      },
      body: JSON.stringify({ orderId, total: totalAmount, payment: paymentDetails })
    });
    const paymentResult = await paymentResponse.json();
    if (!paymentResponse.ok) {
      return res.status(402).json({ error: 'Payment processing failed', details: paymentResult });
    }

    const fraudResponse = await fetch('https://api.lovable.com/v1/fraud/check', {
      method: 'POST',
      headers: {
        'Content-Type': 'application/json',
        'Authorization': 'Bearer YOUR_LOVABLE_API\_KEY'
      },
      body: JSON.stringify({ orderId, amount: totalAmount, customerId })
    });
    const fraudResult = await fraudResponse.json();
    if (!fraudResponse.ok || !fraudResult.pass) {
      return res.status(403).json({ error: 'Fraud check failed', details: fraudResult });
    }
    
    return res.status(200).json({ orderId, status: 'completed', transaction: paymentResult.transactionId });
  } catch (err) {
    return res.status(500).json({ error: 'Server error', details: err.message });
  }
});

app.listen(3001, () => console.log('Server running on port 3001'));

How to Build a Checkout Flow with Lovable's API Integration


const Koa = require('koa');
const Router = require('@koa/router');
const bodyParser = require('koa-bodyparser');
const axios = require('axios');

const app = new Koa();
const router = new Router();

router.post('/api/v2/checkout', async (ctx) => {
  const { customerId, cartItems, paymentDetails, giftMessage, promoCode } = ctx.request.body;
  if (!customerId || !cartItems || !paymentDetails) {
    ctx.status = 400;
    ctx.body = { error: 'Missing required fields' };
    return;
  }

  try {
    // Calculate subtotal, discount, tax and total amount
    const subtotal = cartItems.reduce((sum, item) => sum + (item.price \* item.quantity), 0);
    const discount = promoCode === 'VIPDISCOUNT' ? subtotal \* 0.15 : 0;
    const tax = (subtotal - discount) \* 0.08;
    const totalAmount = subtotal - discount + tax;
    const orderId = 'order\_' + Date.now();

    // Simulate order saving
    const order = {
      orderId,
      customerId,
      items: cartItems,
      giftMessage: giftMessage || null,
      subtotal,
      discount,
      tax,
      totalAmount,
      status: 'pending'
    };

    // Call Lovable API to process payment
    const paymentResponse = await axios.post('https://api.lovable.com/v1/charge', {
      orderId,
      amount: totalAmount,
      payment: paymentDetails,
      metadata: { promoCode, giftMessage }
    }, {
      headers: {
        'Authorization': 'Bearer YOUR_LOVABLE_API\_KEY',
        'Content-Type': 'application/json'
      }
    });

    // If customer is VIP, perform enhanced fraud check
    if (paymentDetails.vipCustomer) {
      const fraudResponse = await axios.post('https://api.lovable.com/v1/fraud/enhanced-check', {
        orderId,
        customerId,
        amount: totalAmount,
        items: cartItems
      }, {
        headers: {
          'Authorization': 'Bearer YOUR_LOVABLE_API\_KEY',
          'Content-Type': 'application/json'
        }
      });
      if (!fraudResponse.data.pass) {
        ctx.status = 403;
        ctx.body = { error: 'Fraud check failed', details: fraudResponse.data };
        return;
      }
    }

    // Update order status as completed (simulate DB update)
    order.status = 'completed';
    
    ctx.status = 200;
    ctx.body = { orderId, status: order.status, transactionId: paymentResponse.data.transactionId };
  } catch (error) {
    ctx.status = error.response ? error.response.status : 500;
    ctx.body = { error: 'Checkout process failed', details: error.message };
  }
});

app.use(bodyParser());
app.use(router.routes());
app.use(router.allowedMethods());
app.listen(3002, () => console.log('Koa server running on port 3002'));

Book a call with an Expert

Starting a new venture? Need to upgrade your web app? RapidDev builds application with your growth in mind.

Book a free No-Code consultation

Best Practices for Building a Checkout flow with AI Code Generators

Understanding the Checkout Flow Concept

This guide explains how to build a checkout flow that leverages AI code generators, which help automate and enhance code creation for optimized checkout processes.
The checkout flow typically involves collecting user cart details, applying discounts, calculating taxes, processing payments, and confirming orders.
Using AI code generators can significantly speed up the development process by generating code snippets for common functionality and by suggesting best practices.

Prerequisites

A basic understanding of web development concepts like HTML, CSS, and JavaScript.
An account with an AI code generator service or tool (for example, GitHub Copilot, ChatGPT, or similar).
A development environment such as a code editor and local server setup.
Familiarity with version control systems like Git is recommended.

Planning Your Checkout Flow

Map out the various steps of your checkout process:
- User cart review
- Enter shipping and billing details
- Select payment method
- Apply discounts or coupon codes
- Finalize and confirm order
Decide which parts of your checkout flow can benefit from automation via AI code generators (for example, dynamically calculating taxes or applying promo codes in real time).
Outline the key user interactions and data validations required at each step.

Designing the User Interface

Create wireframes or mockups for the checkout pages focusing on user-friendly layouts and clear call-to-action buttons.
Keep the design consistent with your overall application style and ensure responsiveness for various devices.
Determine where dynamic content generated by AI can be integrated—for example, tailored promotional messages or personalized recommendations.

Integrating AI Code Generators into Your Workflow

Sign up for and configure your chosen AI code generator tool.
Familiarize yourself with the tool’s features, such as code completion, error detection, and suggestions for best practices.
Use the AI tool to generate boilerplate code for the checkout components. For instance, generate a method for validating form inputs:
```
<pre><code class="hljs">
```
function validateInput(data) {
// AI-generated snippet for input validation
if (!data.email || !data.address) {
return false;
}
return true;
}
Integrate these snippets into your codebase and modify them as needed to meet your specific checkout requirements.

Implementing the Checkout Flow Logic

Start by developing the shopping cart and form management functionality.
Use AI-generated code suggestions to help write functions that compute totals, apply discounts, and calculate taxes. For example:
```
<pre><code class="hljs">
```
function calculateTotal(cartItems) {
let total = 0;
cartItems.forEach(item => {
// Incorporate AI suggestion for dynamic pricing logic
total += item.price * item.quantity;
});
return total;
}
Ensure that each critical function, like payment processing and order confirmation, includes error handling and security validations.
Integrate APIs from payment providers by using AI-supported code generation to quickly scaffold API calls and handle responses.

Testing and Validating the Checkout Flow

Conduct thorough testing on each component of the checkout process, including unit tests for individual functions and integration tests for the complete flow.
Utilize AI testing tools or plugins to suggest test cases that cover various user input scenarios and edge cases.
Review generated code for potential vulnerabilities, particularly in areas handling user payments and sensitive data.

Optimizing the Checkout Flow with AI Insights

Analyze user behavior data to identify bottlenecks or steps where users drop off.
Leverage AI analytics to adjust the checkout flow dynamically by suggesting layout improvements or function optimizations.
Consider A/B testing different versions of the checkout interface and using AI to interpret results and recommend winners.

Deploying and Monitoring Your Checkout Flow

After successful testing, deploy your checkout flow on a staging environment to simulate real-world user interactions.
Monitor performance using AI-based monitoring tools to spot anomalies or slowdowns in the user experience.
Collect user feedback and iterate on the design and functionality by continuously refining AI-generated code suggestions.

Maintaining Best Practices

Ensure code readability and maintainability by adding comments and documentation, even for AI-generated sections.
Regularly review and update dependencies and security practices, especially in the payment and checkout modules.
Incorporate feedback loops with AI enhancements to keep improving both code quality and the user experience over time.

Client trust and success are our top priorities

When it comes to serving you, we sweat the little things. That’s why our work makes a big impact.

Rapid Dev was an exceptional project management organization and the best development collaborators I've had the pleasure of working with. They do complex work on extremely fast timelines and effectively manage the testing and pre-launch process to deliver the best possible product. I'm extremely impressed with their execution ability.

CPO, Praction - Arkady Sokolov

May 2, 2023

Working with Matt was comparable to having another co-founder on the team, but without the commitment or cost. He has a strategic mindset and willing to change the scope of the project in real time based on the needs of the client. A true strategic thought partner!

Co-Founder, Arc - Donald Muir

Dec 27, 2022

Rapid Dev are 10/10, excellent communicators - the best I've ever encountered in the tech dev space. They always go the extra mile, they genuinely care, they respond quickly, they're flexible, adaptable and their enthusiasm is amazing.

Co-CEO, Grantify - Mat Westergreen-Thorne

Oct 15, 2022

Rapid Dev is an excellent developer for no-code and low-code solutions.
We’ve had great success since launching the platform in November 2023. In a few months, we’ve gained over 1,000 new active users. We’ve also secured several dozen bookings on the platform and seen about 70% new user month-over-month growth since the launch.

Co-Founder, Church Real Estate Marketplace - Emmanuel Brown

May 1, 2024

Matt’s dedication to executing our vision and his commitment to the project deadline were impressive.
This was such a specific project, and Matt really delivered. We worked with a really fast turnaround, and he always delivered. The site was a perfect prop for us!

Production Manager, Media Production Company - Samantha Fekete

Sep 23, 2022

How to build Checkout flow with Lovable?

How to build Checkout flow with Lovable?

Checkout Page

Want to explore opportunities to work with us?

How to Build a Seamless Checkout Flow with Lovable in Node.js

How to Build a Checkout Flow with Lovable Using Node.js Express

How to Build a Checkout Flow with Lovable's API Integration

Want to explore opportunities to work with us?

Best Practices for Building a Checkout flow with AI Code Generators

Client trust and success are our top priorities