Stripe integration

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Step-by-step setup

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Part 1 : The Stripe side

1

Create your Stripe account

If you don’t have a Stripe account yet, create one on www.stripe.com.

• Stripe will ask you for your contact info, business details and banking information.
• Not ready to provide those yet? No problem. You can start using Stripe’s sandbox environment, which lets you test everything without moving real money.

You must have an activated account in order to accept real payments. To activate your account, you will need to provide your business and banking details with Stripe. 

2

Get your API key

You’ll find your API keys in your Stripe dashboard.

• Copy and save your secret key somewhere secure, but also keep it handy. You’ll need to paste it into Base44 later. 

If you need extra help, check out Stripe’s API keys guide.

3

Get your webhook secret

To securely send payment updates from Stripe to your app, you’ll need a webhook secret. Stripe uses webhooks to notify your Base44 app when something happens (like a successful payment).

1. Go to the Stripe Workbench and open the Webhooks tab. 
2. Click “Add endpoint” (or “add destination”).
3. Choose the event(s) you need.
   For example,  “checkout.session.completed” is commonly used for one-time payments via Stripe checkout.
   You can choose different events depending on what your app does:

   • Invoice.paid -   is great for subscriptions.
   • payment_intent.succeeded - is great for manual payments.
   • customer.subscription.deleted - is great for managing cancellations. 
4. When asked to choose a destination type, select: Webhook endpoint.
   You might also see Amazon EventBridge which is a tool for advanced apps built with Amazon Web Services (AWS) and used mostly by developers connecting multiple cloud services. If that’s not you, just stick with Webhook endpoint.
5. Add your destination name and app’s URL as the endpoint, then select “Create destination.”

4

After saving, copy the signing secret

The signing secret starts with “whsec” and you can find it in the destination details section.

Note: Keep this secret safe and handy, you’ll also need to paste this into Base44

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Part 2 : The Base44 side

1

Activate backend functions

To use Stripe (and other advanced features) in your Base44 app, you’ll first need to enable backend functions. Here’s how to do it: 

1. Open Base44 and select the app you want to connect to Stripe.
2. Click on the app’s Dashboard
3. Click on Settings. 
4. Scroll down and click on App Settings.
5. Find the section labeled Backend Functions.
6. Click the “Activate” button. 

Prefer to watch a quick demo? Check out this short video.

2

Connect Stripe to your app

Now that backend functions are enabled:

1. In your app’s AI chat, type: integrate with Stripe.
2. Click on “Update secrets” in the chat and when prompted, paste in:
   • Your API key (from Stripe step 2)
   • Your webhook secret (from Stripe Step 3)
   

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Running tests

• Test API key: Stripe gives you a sandbox secret key that works just like the real one but without moving money.  You can find that in Stripe’s API Keys doc. 
• Test cards: Stripe provides sample card numbers to simulate payments. You can find them in Stripe’s testing Doc.

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How to build real payment features in Base44

• Add credits to the user’s account
• Unlock a digital product
• Mark the user as “Pro” or subscribed
• Remove access after a refund

• Always let the user trigger the update
• Your prompts in the AI Chat should reflect that, so the flow works as expected

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Why you can’t use Stripe webhooks alone

• Webhook functions can’t update user data directly (like credits, roles, or subscriptions)
• Even if you use a service key, you may see errors like:
  • 403 Forbidden
  • “You must be logged in to access this app”

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The right way: Let the user trigger the update

1. The user picks something to buy (credits, product, service, etc.)
2. Your app calls a backend function to create a Stripe Checkout session — this includes their user ID
3. The user is sent to Stripe to pay
4. After payment, they’re redirected back to your app
5. On the success page, your app uses the Stripe session ID to:
   • Confirm the payment
   • Match the session to the logged-in user
   • Make the update (like adding credits)

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FAQ