PAY.JP API Client for Node.js

PAY.JP Node.js SDK for v2 API. This library provides a TypeScript-first client for integrating with the PAY.JP payment platform.

Features

• 🚀 TypeScript Support: Full type definitions for all API endpoints
• 🔐 Secure: Built-in authentication with API key management
• 📦 Modern: Uses fetch API with @hey-api/client-fetch
• 🧪 Well Tested: Comprehensive test coverage
• 📚 Auto-generated: API client generated from OpenAPI specification

Installation

npm install @payjp/payjpv2

yarn add @payjp/payjpv2

pnpm install @payjp/payjpv2

Quick Start

Client Initialization

import { createClient } from '@payjp/payjpv2';

const client = createClient({
  apiKey: 'sk_test_xxxxxxxxxxxx', // Your PAY.JP API Key
  baseUrl: 'https://api.pay.jp', // Optional: defaults to PAY.JP API
});

Basic Usage Examples

Customer Management

import { createCustomer, getCustomer, updateCustomer } from '@payjp/payjpv2';

// Create a customer
const result = await createCustomer({
  client,
  body: {
    email: 'customer@example.com',
    description: 'New Customer',
  }
});

if (result.error) {
  console.error('Error:', result.error);
} else {
  console.log('Customer created:', result.data);

  // Get customer details
  const customer = await getCustomer({
    client,
    path: { customer_id: result.data.id }
  });

  console.log('Retrieved customer:', customer.data);
}

Payment Flow Operations

import {
  createPaymentFlow,
  confirmPaymentFlow,
  capturePaymentFlow
} from '@payjp/payjpv2';

// Create a payment flow
const paymentFlow = await createPaymentFlow({
  client,
  body: {
    amount: 1000, // Amount in yen (e.g., 1000 = ¥1,000)
  }
});

if (paymentFlow.data) {
  // Confirm the payment flow with a payment method
  const confirmed = await confirmPaymentFlow({
    client,
    path: { payment_flow_id: paymentFlow.data.id },
    body: {
      payment_method: 'pm_xxxxxxxxxxxx'
    }
  });

  console.log('Payment confirmed:', confirmed.data);
}

Product and Price Management

import { createProduct, createPrice } from '@payjp/payjpv2';

// Create a product
const product = await createProduct({
  client,
  body: {
    name: 'Premium Plan',
  }
});

// Create a price for the product
if (product.data) {
  const price = await createPrice({
    client,
    body: {
      unit_amount: 1500,
      currency: 'jpy',
      product: product.data.id,
    }
  });

  console.log('Price created:', price.data);
}

API Reference

Core Functions

The SDK provides functions for all PAY.JP v2 API endpoints:

Customer Management

• createCustomer() - Create a new customer
• getCustomer() - Retrieve customer details
• updateCustomer() - Update customer information
• deleteCustomer() - Delete a customer
• getAllCustomers() - List all customers

Payment Flows

• createPaymentFlow() - Create a payment flow
• getPaymentFlow() - Get payment flow details
• updatePaymentFlow() - Update payment flow
• confirmPaymentFlow() - Confirm a payment flow
• capturePaymentFlow() - Capture an authorized payment
• cancelPaymentFlow() - Cancel a payment flow
• getAllPaymentFlows() - List payment flows

Payment Methods

• createPaymentMethod() - Create a payment method
• getPaymentMethod() - Retrieve payment method details
• updatePaymentMethod() - Update payment method
• getAllPaymentMethods() - List payment methods

Products and Prices

• createProduct(), getProduct(), updateProduct(), deleteProduct()
• createPrice(), getPrice(), updatePrice()

Refunds

• createPaymentRefund() - Create a refund
• getPaymentRefund() - Get refund details
• updatePaymentRefund() - Update refund
• getAllPaymentRefunds() - List refunds

Setup Flows

• createSetupFlow() - Create a setup flow
• getSetupFlow() - Get setup flow details
• updateSetupFlow() - Update setup flow
• confirmSetupFlow() - Confirm a setup flow
• cancelSetupFlow() - Cancel a setup flow
• getAllSetupFlows() - List setup flows

Checkout Sessions

• createCheckoutSession(), getCheckoutSession(), updateCheckoutSession()

Error Handling

The SDK returns errors in a consistent format:

import { createCustomer } from '@payjp/payjpv2';

const result = await createCustomer({
  client,
  body: {
    email: 'customer@example.com'
  }
});

if (result.error) {
  console.error('API Error:', result.error);
} else {
  console.log('Success:', result.data);
}

Common Error Types

• invalid_request_error - Invalid parameters or malformed request
• authentication_error - Invalid API key
• permission_error - Insufficient permissions
• rate_limit_error - Too many requests
• api_error - Internal server error

Configuration

Environment Variables

For security, store your API key in environment variables:

# .env file
PAYJP_API_KEY=sk_test_xxxxxxxxxxxx

import { createClient } from '@payjp/payjpv2';

const client = createClient({
  apiKey: process.env.PAYJP_API_KEY!,
});

Custom Base URL

For testing or custom endpoints:

const client = createClient({
  apiKey: 'sk_test_xxxxxxxxxxxx',
  baseUrl: 'https://custom-api.example.com'
});

TypeScript Support

The SDK is built with TypeScript and provides full type safety:

import type { CustomerResponse, PaymentFlowResponse } from '@payjp/payjpv2';
import { createCustomer } from '@payjp/payjpv2';

// Types are automatically inferred from API responses
const result = await createCustomer({
  client,
  body: {
    email: 'test@example.com'
  }
});

if (result.data) {
  const customer: CustomerResponse = result.data;
  console.log(customer.id);
}

Testing

The SDK includes comprehensive tests. To run them:

npm test        # Run tests
npm run build   # Build the project
npm run lint    # Type check

Requirements

• Node.js 20 or higher
• TypeScript 5.0+ (for TypeScript projects)

Support

• PAY.JP Documentation
• GitHub Issues

License

MIT License - see LICENSE for details.