/how-to-build-lovable

How to build Subscription box service with Lovable?

Discover how to launch a thriving subscription box service with Lovable. Our expert guide reveals essential steps and strategies to fuel your business growth.

Matt Graham, CEO of Rapid Developers

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How to build Subscription box service with Lovable?

 
Project Setup in Lovable
 

Create a new Lovable project using the Lovable dashboard. In your project file viewer, create three new files: one for the HTML markup (index.html), one for the CSS styling (subscription.css), and one for the JavaScript functionality (subscription.js).

  • Create a file named index.html in the root folder. Paste the following code into it:



  
    
    Subscription Box Service
    
    
    
  
  
    

Subscribe to Our Box!

  • Create a file named subscription.css in the same project folder and insert the following styles:

/_ subscription.css _/
#subscription-container {
  width: 300px;
  margin: 0 auto;
  text-align: center;
  padding: 20px;
  border: 1px solid #ddd;
  border-radius: 8px;
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}
#subscription-form input {
  width: 100%;
  padding: 8px;
  margin: 10px 0;
  box-sizing: border-box;
}
#subscription-form button {
  padding: 10px 20px;
  background-color: #007BFF;
  color: #fff;
  border: none;
  cursor: pointer;
  border-radius: 4px;
}
  • Create a file named subscription.js in the project root and insert the following code to handle the form submission:

/_ subscription.js _/
document.getElementById('subscription-form').addEventListener('submit', function(e) {
  e.preventDefault();
  var email = document.getElementById('email').value;
  
  // Update the message div to inform the user
  document.getElementById('message').innerText = 'Processing your subscription...';
  
  // Use Lovable's built-in API call to process the subscription
  lovable.post('/api/subscribe', { email: email }, function(response) {
    if (response.success) {
      document.getElementById('message').innerText = 'Subscription successful!';
    } else {
      document.getElementById('message').innerText = 'An error occurred. Please try again.';
    }
  });
});

 
Configuring Dependencies Without a Terminal
 

Since Lovable does not have a terminal for installing dependencies, you must declare dependencies within a configuration file. Create a file named lovable_config.json in the root folder and include the following code. This informs Lovable which packages to use:


{
  "dependencies": {
    "lovable-api": "latest",
    "express": "latest"
  }
}
  • This file instructs Lovable to automatically install the required packages when your project loads.

 
Creating Serverless Function for Subscription Processing
 

Lovable supports serverless functions to handle API requests. Create a new folder named functions in your project. Inside this folder, create a file named subscribe.js and add the following code. This simulates backend processing for subscription requests:


/_ File: functions/subscribe.js _/
module.exports = function(request, response) {
  // Extract the email submitted in the request body
  const { email } = request.body;
  
  // Implement your subscription logic here, such as saving the email to a database
  // For the purpose of this demo, we simply return a success response
  response.json({ success: true, message: 'Subscription processed successfully.' });
};

 
Mapping the API Endpoint to Your Serverless Function
 

To connect your frontend API call with the serverless function, create a mapping file named lovable_routes.json in the project root. Insert the following code:


{
  "/api/subscribe": "functions/subscribe.js"
}
  • This configuration maps requests made to /api/subscribe directly to your subscribe.js function.

 
Testing Your Subscription Box Service
 

  • Save all the files you have created in your Lovable project.
  • Use Lovable’s built-in preview feature to open your project in a web browser.
  • Enter an email in the subscription field and click the Subscribe button to test the functionality.
  • You should see a processing message that eventually updates to indicate success or an error based on the response from your serverless function.

 
Making Further Adjustments
 

  • If you need to adjust the styling, update subscription.css.
  • To refine the subscription logic, modify the code in functions/subscribe.js.
  • Any new dependency can be added by editing the lovable\_config.json file accordingly.

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How to create a subscription API endpoint for your Lovable Subscription Box service


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

app.use(bodyParser.json());

app.post('/api/subscribe', async (req, res) => {
  try {
    const { userId, subscriptionPlan, boxItems } = req.body;
    if (!userId || !subscriptionPlan || !Array.isArray(boxItems)) {
      return res.status(400).json({ error: 'Invalid payload' });
    }

    const subscription = {
      userId,
      subscriptionPlan,
      boxItems: boxItems.map(item => ({
        productId: item.productId,
        quantity: item.quantity || 1,
        customizations: item.customizations || {}
      })),
      createdAt: new Date(),
      status: 'active'
    };

    // Simulated DB insertion; replace with actual DB logic
    console.log('New subscription created:', subscription);
    
    res.status(201).json({ message: 'Subscription successfully created', subscription });
  } catch (err) {
    res.status(500).json({ error: 'Internal server error' });
  }
});

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

How to set up a secure webhook endpoint for your Lovable subscription box service


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

app.use(bodyParser.json());

app.post('/api/webhooks/lovable', async (req, res) => {
  try {
    const signature = req.headers['x-lovable-signature'];
    const payload = JSON.stringify(req.body);
    const secret = process.env.LOVABLE_WEBHOOK_SECRET;
    const computedSignature = crypto.createHmac('sha256', secret).update(payload).digest('hex');

    if (signature !== computedSignature) {
      return res.status(401).json({ error: 'Invalid signature.' });
    }

    const eventType = req.body.type;
    if (eventType === 'subscription.shipped') {
      const shippingData = {
        subscriptionId: req.body.data.subscriptionId,
        trackingNumber: req.body.data.trackingNumber,
        shippedAt: req.body.data.shippedAt
      };

      const shippingResponse = await axios.post(
        'https://api.shippingpartner.com/notify',
        shippingData,
        { headers: { 'Authorization': `Bearer ${process.env.SHIPPING_API_TOKEN}` } }
      );

      console.log('Shipping partner notified:', shippingResponse.data);
    }

    res.status(200).json({ received: true });
  } catch (error) {
    console.error('Webhook processing error:', error);
    res.status(500).json({ error: 'Internal server error' });
  }
});

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

How to cancel a subscription in your Lovable-powered service


const { Router } = require('express');
const fetch = require('node-fetch');
const router = Router();

router.post('/api/subscription/cancel', async (req, res) => {
  const { subscriptionId, userToken } = req.body;
  if (!subscriptionId || !userToken) {
    return res.status(400).json({ error: 'Missing subscriptionId or userToken' });
  }

  try {
    const lovableResponse = await fetch('https://api.lovable.com/subscriptions/cancel', {
      method: 'POST',
      headers: {
        'Authorization': `Bearer ${userToken}`,
        'Content-Type': 'application/json'
      },
      body: JSON.stringify({ id: subscriptionId })
    });
    
    if (!lovableResponse.ok) {
      const errorBody = await lovableResponse.text();
      return res.status(502).json({ error: 'Failed to cancel subscription in Lovable', details: errorBody });
    }
    
    await updateLocalSubscriptionStatus(subscriptionId, 'cancelled');
    res.status(200).json({ message: 'Subscription cancelled successfully.' });
  } catch (err) {
    res.status(500).json({ error: 'Internal server error', details: err.message });
  }
});

async function updateLocalSubscriptionStatus(subscriptionId, status) {
  // Placeholder for actual database update logic.
  return new Promise((resolve) => setTimeout(resolve, 100));
}

module.exports = router;

Want to explore opportunities to work with us?

Connect with our team to unlock the full potential of no-code solutions with a no-commitment consultation!

Book a Free Consultation
Matt Graham, CEO of Rapid Developers

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 Subscription box service with AI Code Generators

 
Introduction to Subscription Box Services
 

  • This guide walks you through best practices for building a subscription box service.
  • The service delivers curated products to subscribers on a recurring basis.
  • It combines a user-friendly platform with efficient backend management to ensure smooth operations.

 
Prerequisites and Planning
 

  • Define your niche and target audience for the subscription box.
  • Outline the subscription terms, pricing, and box contents.
  • Plan your technology stack, including website builders, backend services, and third-party integrations.
  • Decide on the role of AI code generators in streamlining your development process.

 
Designing Your Subscription Model
 

  • Perform market research to tailor the subscription box to customer interests.
  • Determine the frequency of the box (monthly, quarterly, etc.).
  • Establish clear pricing, discounts for long-term subscriptions, and promotional offers.
  • Map out customer experience from sign-up to delivery.

 
Leveraging AI Code Generators
 

  • Use AI tools to help generate boilerplate code for your website and backend services.
  • Integrate AI code generators to speed up development and reduce manual errors.
  • Review and test the generated code to ensure it meets your service requirements.
  • Below is an example of using an AI code generator to build a simple function for code automation:
    
    import openai
    
    

    def generate_code(prompt):
    response = openai.Completion.create(
    engine="davinci-codex",
    prompt=prompt,
    max_tokens=150
    )
    return response.choices[0].text.strip()

    generated_code = generate_code("Build a subscription management function")
    print(generated_code)


 
Building the Core Platform
 

  • Create a user-friendly website with clear navigation for subscriptions.
  • Integrate a secure payment gateway and customer account management.
  • Set up an administrative dashboard to manage subscribers and track orders.
  • You may build API endpoints to handle subscription requests. Example in Python using Flask:
    
    from flask import Flask, request, jsonify
    
    

    app = Flask(name)

    @app.route("/subscribe", methods=["POST"])
    def subscribe():
    data = request.get_json()
    email = data.get("email")
    # Add logic to process the subscription
    return jsonify({"message": "Subscription successful for " + email}), 200

    if name == "main":
    app.run(debug=True)


 
Implementing Payment and Subscription Management
 

  • Integrate trusted payment services such as Stripe or PayPal to manage billing.
  • Automate recurring billing procedures, including renewals and cancellations.
  • Monitor transactions and ensure data security throughout payment processes.
  • Example using Stripe API to create a subscription:
    
    import stripe
    
    

    stripe.api_key = "your_stripe_secret_key"

    def create_subscription(customer_id, plan_id):
    subscription = stripe.Subscription.create(
    customer=customer_id,
    items=[{"plan": plan_id}],
    )
    return subscription


 
Testing and Deployment
 

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May 1, 2024 

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