Lovable E-commerce Tutorial: Build a Store in 25 Minutes [Stripe + Printful + AI]

Kristoffer · August 25, 2025 · 11 min read

Building a revenue-ready AI e-commerce app used to take months and cost $50k+. Not anymore.

In this comprehensive Lovable tutorial, you'll build a complete AI-powered e-commerce platform in under 25 minutes - without writing a single line of code.

You'll plan with Braindumper, build the UI and logic in Lovable, wire AI image generation, add Supabase auth + storage, integrate Printful for the e-commerce platform, take payments with Stripe, and deploy on Vercel with a custom domain.

PS: I've included all the prompts used in the video at the bottom of this page 🫡

What You'll Build

An AI e-commerce app that:

• Lets users upload one or two reference images plus a text prompt
• Generates a single customized design with AI from those inputs
• Lets users choose a product, preview the design on it, add to cart, and check out

Tools Used in This Lovable Tutorial

• Braindumper: turns your idea into a precise, tool-specific build prompt + knowledge file
• Lovable: AI builds the full web app (they recently reported hitting "$100M ARR in 8 months," and their new Agent claims "91% fewer errors")
• Supabase: database, auth, secure key storage
• AI Image API: Replicate (Stable Diffusion image-to-image)
• Mobbin: premium UI references to one-shot a clean, "premium" front-end
• Printful: catalog, product customization, order submission
• Stripe: payments (test mode for dev)
• GitHub + Vercel: repository + hosting
• Spaceship: domain + DNS

Step 1: Prep the Idea in Braindumper

Before diving into the Lovable AI app builder, we need to create a clear blueprint:

1. Open Braindumper
2. Describe the app at a high level: "Build an app that lets users upload two images and a prompt, then generate a single customized design we can print on clothing."
3. Specify the AI model you'll use
4. Click Generate Plan and copy:
   • Initial Prompt (for Lovable)
   • Knowledge File (paste into Lovable's "Knowledge" later)

Step 2: Build the App in Lovable

Now let's start building an app with Lovable:

1. Paste Braindumper's Initial Prompt into Lovable
2. Generate the first draft and test the basic flow (file inputs, prompt field, preview)
3. Iterate the UX via prompts:
   • "Make the flow 3 simple steps: (1) Upload & prompt → (2) Result & iteration → (3) Choose products."
   • "Keep everything minimal and premium."

Add the Knowledge File

1. Go to Project menu → Settings → Knowledge
2. Paste your Braindumper context

Make the UI Premium with Mobbin

In this Lovable tutorial, we'll create a professional-looking interface:

1. In Mobbin, find clean, minimal, premium references (marketing pages work great)
2. Upload up to 10 screenshots into Lovable (that's the limit)
3. Prompt: "Use these as visual inspiration. Replicate this style for our app."

Step 3: Core Feature: Set Up AI Image Generation

For the AI functionality in our Lovable full course project:

Replicate (Model: Stable Diffusion, Image-to-Image)

1. Go to replicate.com and create an account
2. Navigate to API Tokens and generate a new one
3. Prompt in Lovable: "For the core feature of the app I'm going to use Replicate with the Stable Diffusion image-to-image model. I have the API key ready, so let's implement it by saving the API key in Supabase secrets."
4. Paste in the API key when prompted

Step 4: Connect Supabase (API Keys, DB, Auth)

This is where the Lovable AI app builder really shines with its integrations:

1. Create a Supabase project
2. In Lovable, click Connect Supabase (top-right icon)
3. Securely store your API keys via Lovable's "Add API key" button → Lovable stores them in Supabase, not unsafely in the codebase
4. Apply DB changes as Lovable proposes. If you see:
   • Security warnings → accept Lovable's auto-fix
   • Function permission issues → click Apply changes again
5. Add Authentication (email/password) with a single prompt; Lovable sets it up automatically
6. Test signup: create a user; confirm in Supabase Dashboard → Authentication → Users

Step 5: Integrate Printful (Catalog, Customization, Orders)

For the e-commerce functionality in our Lovable tutorial:

1. In Printful, create a store
2. Go to developers.printful.com → Tokens and create an API token
3. Scopes used (via Claude's recommendation):
   • View store products
   • View & manage store products
   • View & manage store files
   • View & manage orders
   • View orders of the authorized store
4. Add an expiration (e.g., start of 2026)
5. Tell Lovable you're setting up the Printful integration, and paste the token in Lovable (then Add API key)

Let Lovable:

• Create required tables
• Build product selection and customization UI
• Wire the cart and order flow

Step 6: Add Stripe Checkout (Pay First, Then Fulfill the Order)

Building an app with Lovable includes seamless payment integration:

1. In Stripe, enable Test mode
2. In Lovable, click the Stripe button in the top right corner
3. Copy the secret test key → add to Lovable as a secure key
4. Run the app in a real browser (not the embedded Lovable preview) so Stripe Checkout can open a new tab
5. Test with the Stripe card 4242 4242 4242 4242 + any valid future expiry + any CVC

Step 7: Debug Printful Order Submission

If "Submit Order" fails (e.g., HTTP 400):

1. Open DevTools → Network → click the failing request
2. Copy the full error and paste it into Lovable chat with context
3. In the video, the issue was Printful file formatting (design uploads must follow strict requirements)
4. Chat back and forth with Lovable until the problems are fixed (using Lovable's Chat mode)

At this point you have:

• Product selection + customization
• User auth
• Stripe payment
• Order submission to Printful (after payment)

Step 8: Deploy + Custom Domain (GitHub → Vercel)

The final step in our Lovable full course:

GitHub

1. Go to Github.com and create an account
2. In Lovable, click GitHub → Create repo → push the codebase
3. Back in GitHub, refresh the Dashboard page, and you'll see the codebase added

Vercel

1. Connect the GitHub repo → one-click deploy → your app is hosted live on the web with a .vercel.app domain

Custom Domain

1. In Vercel project Settings → Domains → Add domain
2. Buy a domain (Spaceship)
3. Add the two DNS records Vercel requests (propagation usually takes like 2 minutes)
4. Search for your domain → your AI e-commerce app is live 🎉

Prompts Used in the Video

Here are the exact prompts from this Lovable tutorial:

Simplify Flow

"Keep everything minimal, three steps: (1) Upload & prompt → (2) Result & iteration → (3) Choose products. Clean, premium feel."

Use References for Premium UI

"Use these images as design inspiration. Replicate this clean, minimalist, premium style across all pages."

Model Switch

"Replace current image generation with Replicate (Stable Diffusion image-to-image). Keep the same inputs (two images + prompt)."

Stripe Before Printful

"Collect payment via Stripe Checkout, then submit the order to Printful only after payment succeeds."

Debugging

"Here's the full error from DevTools Network tab: [ERROR]. Fix the root cause and update any file format requirements for Printful."

Final Thoughts

Congratulations! You've just completed a comprehensive Lovable AI app builder tutorial and built a fully functional AI e-commerce application. This Lovable full course demonstrates how powerful modern AI tools have become for building apps with Lovable.

The combination of Braindumper for planning, Lovable for development, and integrated services like Supabase, Stripe, and Printful shows how accessible app development has become. Whether you're a beginner or experienced developer, this Lovable tutorial proves that you can ship revenue-ready applications without traditional coding.

Ready to build your next AI-powered app? Start with Braindumper and let the Lovable AI app builder handle the rest!