Getting started

Create an account

Connect payments

In Settings → Billing, add your zahls API credentials and configure webhooks so Kwit can tokenize cards and receive payment confirmations.

Create a product

In Products, define pricing (amount, currency, billing interval). Note the product ID for API calls.

Issue an API key

Go to Developers → API Keys. Create a key with prefix kwit_live_. Store it securely - it is shown once.

Call the API

curl -X POST https://api.kwit.dev/v1/customers \
  -H "Authorization: Bearer kwit_live_YOUR_KEY" \
  -H "Content-Type: application/json" \
  -d '{"email":"user@example.com","name":"Jane Doe"}'

Or use the SDK:

import Kwit from "@kwit/sdk";

const kwit = new Kwit("kwit_live_YOUR_KEY");
const customer = await kwit.customers.create({
  email: "user@example.com",
  name: "Jane Doe",
});

Start a checkout

const checkout = await kwit.checkout.create({
  customerId: customer.id,
  priceId: "YOUR_PRICE_ID",
  successUrl: "https://your-app.com/success",
  cancelUrl: "https://your-app.com/cancel",
});
// Redirect end-user to checkout.checkoutUrl

For local development, point the SDK at your server with baseUrl if you run apps/server locally (default production base is https://api.kwit.dev/v1).