PayKit Core

The unified Payment SDK for TypeScript developers.

Installation

npm install @paykit-sdk/core

Quick Start

import { PayKit } from '@paykit-sdk/core';
import { createStripe } from '@paykit-sdk/stripe';

// Initialize with a provider
const provider = createStripe({ apiKey: process.env.STRIPE_API_KEY });
const paykit = new PayKit(provider);

// Create a checkout session
const checkout = await paykit.checkouts.create({
  customer_id: 'cus_1234',
  metadata: { plan: 'pro' },
  session_type: 'recurring',
  item_id: 'pri_12345',
  quantity: 1,
  cancel_url: 'http://localhost:3000',
  success_url: 'http://localhost:3000',
  provider_metadata: {},
});

API

PayKit provides a unified interface for payment operations:

• Checkouts - Create and retrieve checkout sessions
• Customers - Manage customer data
• Subscriptions - Handle subscription lifecycle
• Webhooks - Process payment events

Providers

PayKit works with multiple payment providers:

• @paykit-sdk/stripe - Stripe integration
• @paykit-sdk/polar - Polar integration
• @paykit-sdk/paypal - PayPal integration
• Custom providers - Build your own