QBitFlow JavaScript/TypeScript SDK

Official JavaScript/TypeScript SDK for QBitFlow - a comprehensive cryptocurrency payment processing platform that enables seamless integration of crypto payments, recurring subscriptions, and pay-as-you-go models into your applications.

Features

• 🔐 Type-Safe: Full TypeScript support with comprehensive type definitions
• 🚀 Easy to Use: Simple, intuitive API design
• 🔄 Automatic Retries: Built-in retry logic for failed requests
• ⚡ Real-time Updates: WebSocket support for transaction status monitoring
• 📦 Dual Package: Works with both CommonJS and ES modules
• 🧪 Well Tested: Comprehensive test coverage
• 📚 Great Documentation: Detailed docs with examples
• 🔌 Webhook Support: Handle payment notifications easily
• 💳 One-Time Payments: Accept cryptocurrency payments with ease
• 🔄 Recurring Subscriptions: Automated recurring billing in cryptocurrency
• 📊 Pay-as-You-Go: Usage-based billing with cryptocurrency
• 👥 Customer Management: Create and manage customer profiles
• 🛍️ Product Management: Organize your products and pricing
• 📈 Transaction Tracking: Real-time transaction status updates
• 🔐 Secure Authentication: API key-based authentication
• 🎯 Type-Safe: Full type hints for better IDE support
• 📝 Comprehensive Documentation: Detailed docstrings and examples

Table of Contents

• Features
• Installation
• Quick Start
  • 1. Get Your API Key
  • 2. Initialize the Client
  • 3. Create a One-Time Payment
  • 4. Create a Recurring Subscription
  • 5. Check Transaction Status
• Configuration
• One-Time Payments
  • Create a Payment Session
  • With Redirect URLs
  • Get Payment Session
  • Get Completed Payment
  • List All Payments
  • List Combined Payments
• Subscriptions
  • Create a Subscription
  • Frequency Units
  • Get Subscription
  • Get all payments for subscription
  • Execute Test Billing Cycle
• Pay-As-You-Go Subscriptions
  • Create PAYG Subscription
  • Get PAYG Subscription
  • Get all payments for PAYG subscription
  • Execute Test Billing Cycle
  • Increase units current period
• Transaction Status
  • Check Status
  • Transaction Types
  • Status Values
• Customer Management
  • Create a Customer
  • Get Customer by UUID
  • Update Customer
  • Delete Customer
• Product Management
  • Create a Product
  • Update Product
  • Delete Product
• Webhook Handling
  • Express.js Example
• Error Handling
• API Reference
  • QBitFlow
    • Constructor
    • Properties
• License
• Support
• Changelog

Installation

npm install qbitflow

Or using yarn:

yarn add qbitflow

Quick Start

1. Get Your API Key

Sign up at QBitFlow and obtain your API key from the dashboard.

2. Initialize the Client

import { QBitFlow } from 'qbitflow';

// Initialize the client
const client = new QBitFlow('your-api-key');

3. Create a One-Time Payment

// Create a one-time payment
const payment = await client.oneTimePayments.createSession({
	productId: 1,
	customerUUID: 'customer-uuid',
	webhookUrl: 'https://yourapp.com/webhook',
	successUrl: 'https://yourapp.com/success',
	cancelUrl: 'https://yourapp.com/cancel',
});

console.log('Payment link:', payment.link);
// Send this link to your customer

4. Create a Recurring Subscription

const subscription = await client.subscriptions.createSession({
	productId: 1,
	frequency: { unit: 'months', value: 1 }, // Bill monthly
	trialPeriod: { unit: 'days', value: 7 }, // 7-day trial (optional)
	webhookUrl: 'https://yourapp.com/webhook',
	customerUUID: 'customer-uuid',
});

console.log('Subscription link:', subscription.link);

5. Check Transaction Status

import { TransactionType, TransactionStatusValue } from 'qbitflow';

const status = await client.transactionStatus.get(
	'transaction-uuid',
	TransactionType.ONE_TIME_PAYMENT
);

if (status.status === TransactionStatusValue.COMPLETED) {
	console.log('Payment completed! Transaction hash:', status.txHash);
} else if (status.status === TransactionStatusValue.FAILED) {
	console.log('Payment failed:', status.message);
}

Configuration

Configuration Options

| Option | Type | Default | Description | | ------------ | ------ | -------------------------- | -------------------------------------------- | | apiKey | string | (required) | Your QBitFlow API key | | baseUrl | string | https://api.qbitflow.app | API base URL | | timeout | number | 30000 | Request timeout in milliseconds | | maxRetries | number | 3 | Number of retry attempts for failed requests |

One-Time Payments

Create a Payment Session

Create a payment session for a one-time purchase:

// Using an existing product
const payment = await client.oneTimePayments.createSession({
	productId: 1,
	customerUUID: 'customer-uuid', // optional
	webhookUrl: 'https://yourapp.com/webhook',
});

// Or create a custom payment
const payment = await client.oneTimePayments.createSession({
	productName: 'Custom Product',
	description: 'Product description',
	price: 99.99, // USD
	customerUUID: 'customer-uuid',
	webhookUrl: 'https://yourapp.com/webhook',
});

console.log(payment.uuid); // Session UUID
console.log(payment.link); // Payment link for customer

With Redirect URLs

You can provide redirect URLs for success and cancellation:

const payment = await client.oneTimePayments.createSession({
	productId: 1,
	successUrl: 'https://yourapp.com/success?uuid={{UUID}}&type={{TRANSACTION_TYPE}}',
	cancelUrl: 'https://yourapp.com/cancel',
	customerUUID: 'customer-uuid',
});

Available Placeholders:

• {{UUID}}: The session UUID
• {{TRANSACTION_TYPE}}: The transaction type (e.g., "payment", "subscription", "payAsYouGo")

Get Payment Session

Retrieve details of a payment session:

const session = await client.oneTimePayments.getSession('session-uuid');
console.log(session.productName, session.price);

Get Completed Payment

Retrieve details of a completed payment:

const payment = await client.oneTimePayments.get('payment-uuid');
console.log(payment.transactionHash, payment.amount);

List All Payments

List all one-time payments with pagination:

const result = await client.oneTimePayments.getAll({ limit: 10 });

console.log(result.items); // Array of payments
console.log(result.hasMore()); // Whether there are more pages
console.log(result.nextCursor); // Cursor for next page

// Fetch next page
if (result.hasMore()) {
	const nextPage = await client.oneTimePayments.getAll({
		limit: 10,
		cursor: result.nextCursor,
	});
}

List Combined Payments

Get all payments (one-time and subscription payments combined):

const result = await client.oneTimePayments.getAllCombined({ limit: 20 });
result.items.forEach((payment) => {
	console.log(payment.source); // "payment" or "subscription_history"
	console.log(payment.amount);
});

Subscriptions

Create a Subscription

Create a recurring subscription:

const subscription = await client.subscriptions.createSession({
	productId: 1,
	frequency: { unit: 'months', value: 1 }, // Bill monthly
	trialPeriod: { unit: 'days', value: 7 }, // 7-day trial (optional)
	minPeriods: 3, // Minimum billing periods (optional)
	webhookUrl: 'https://yourapp.com/webhook',
	customerUUID: 'customer-uuid',
});

console.log(subscription.link); // Send to customer

Frequency Units

Available units for frequency and trialPeriod:

• seconds
• minutes
• hours
• days
• weeks
• months

Get Subscription

Retrieve subscription details:

const subscription = await client.subscriptions.get('subscription-uuid');
console.log(subscription.status, subscription.nextBillingDate);

Get all payments for subscription

const history = await client.subscriptions.getPaymentHistory('subscription-uuid');
history.forEach((record) => {
	console.log(record.uuid, record.amount, record.createdAt);
});

Execute Test Billing Cycle

Test Mode Only: Manually trigger a billing cycle for testing.

For live mode: Billing cycles are executed automatically based on the subscription frequency.

const result = await client.subscriptions.executeTestBilling('subscription-uuid');
console.log('Transaction status link:', result.statusLink);

Pay-As-You-Go Subscriptions

PAYG subscriptions allow customers to pay based on usage with a billing cycle.

Create PAYG Subscription

const payg = await client.payAsYouGo.createSession({
	productId: 1,
	frequency: { unit: 'months', value: 1 }, // Bill monthly
	freeCredits: 100, // Initial free credits (optional)
	webhookUrl: 'https://yourapp.com/webhook',
	customerUUID: 'customer-uuid',
});

console.log(payg.link);

Get PAYG Subscription

const payg = await client.payAsYouGo.get('payg-uuid');
console.log(payg.allowance, payg.unitsCurrentPeriod);

Get all payments for PAYG subscription

const history = await client.payAsYouGo.getPaymentHistory('payg-uuid');
history.forEach((record) => {
	console.log(record.uuid, record.amount, record.createdAt);
});

Execute Test Billing Cycle

Test Mode Only: Manually trigger a billing cycle for testing.

For live mode: Billing cycles are executed automatically based on the subscription frequency.

const result = await client.payAsYouGo.executeTestBilling('subscription-uuid');
console.log('Transaction status link:', result.statusLink);

Increase units current period

Increase the number of units for the current billing period:

// For example, the product is billed per hour of usage, and the customer consumed 5 additional hours
const response = await client.payAsYouGo.increaseUnitsCurrentPeriod('payg-uuid', 5);

Transaction Status

Check Status

Get the current status of a transaction:

import { TransactionType } from 'qbitflow';

const status = await client.transactionStatus.get(
	'transaction-uuid',
	TransactionType.ONE_TIME_PAYMENT
);

console.log(status.status); // "created", "pending", "completed", etc.
console.log(status.txHash); // Blockchain transaction hash

Transaction Types

enum TransactionType {
	/** One-time payment transaction */
	ONE_TIME_PAYMENT = 'payment',
	/** Create subscription transaction */
	CREATE_SUBSCRIPTION = 'createSubscription',
	/** Cancel subscription transaction */
	CANCEL_SUBSCRIPTION = 'cancelSubscription',
	/** Execute subscription payment transaction */
	EXECUTE_SUBSCRIPTION_PAYMENT = 'executeSubscription',
	/** Create pay-as-you-go subscription transaction */
	CREATE_PAYG_SUBSCRIPTION = 'createPAYGSubscription',
	/** Cancel pay-as-you-go subscription transaction */
	CANCEL_PAYG_SUBSCRIPTION = 'cancelPAYGSubscription',
	/** Increase allowance transaction */
	INCREASE_ALLOWANCE = 'increaseAllowance',
	/** Update max amount transaction */
	UPDATE_MAX_AMOUNT = 'updateMaxAmount',
}

Status Values

enum TransactionStatusValue {
	/** Transaction has been created but not yet processed */
	CREATED = 'created',
	/** Waiting for blockchain confirmation */
	WAITING_CONFIRMATION = 'waitingConfirmation',
	/** Transaction is pending processing */
	PENDING = 'pending',
	/** Transaction has been successfully completed */
	COMPLETED = 'completed',
	/** Transaction has failed */
	FAILED = 'failed',
	/** Transaction has been cancelled */
	CANCELLED = 'cancelled',
	/** Transaction has expired */
	EXPIRED = 'expired',
}

Customer Management

Create a Customer

const customerData: CreateCustomerDto = {
	name: 'John',
	lastName: 'Doe',
	email: '[email protected]',
	phoneNumber: '+1234567890',
	reference: 'CRM-12345',
};

const customer = await client.customers.create(customerData);
console.log('Customer created:', customer.uuid);

Get Customer by UUID

const customer = await client.customers.get('customer-uuid');
console.log(`${customer.name} ${customer.lastName} - ${customer.email}`);

Update Customer

const updateData: UpdateCustomerDto = {
	name: 'John',
	lastName: 'Doe',
	email: '[email protected]',
	phoneNumber: '+9876543210',
};

const updatedCustomer = await client.customers.update('customer-uuid', updateData);

Delete Customer

const response = await client.customers.delete('customer-uuid');
console.log(response.message);

Product Management

Create a Product

const productData: CreateProductDto = {
	name: 'Premium Subscription',
	description: 'Access to all premium features',
	price: 29.99,
	reference: 'PROD-PREMIUM',
};

const product = await client.products.create(productData);
console.log('Product created: ID', product.id);

Update Product

const updateData: UpdateProductDto = {
	name: 'Premium Plus',
	description: 'Enhanced premium features',
	price: 39.99,
};

const updatedProduct = await client.products.update(1, updateData);

Delete Product

const response = await client.products.delete(1);

Webhook Handling

Express.js Example

import express from 'express';
import { QBitFlow, SessionWebhookResponse, TransactionStatusValue } from 'qbitflow';

const app = express();
const client = new QBitFlow('your-api-key');

app.use(express.json());

app.post('/webhook', (req, res) => {
	const event = req.body as SessionWebhookResponse;

	console.log('Webhook received:', event.uuid);
	console.log('Status:', event.status.status);

	if (event.status.status === TransactionStatusValue.COMPLETED) {
		console.log('Payment completed!');
		// Handle successful payment
	} else if (event.status.status === TransactionStatusValue.FAILED) {
		console.log('Payment failed');
	}

	res.status(200).json({ received: true });
});

app.listen(3000, () => {
	console.log('Webhook server running on port 3000');
});

Webhook Payload

interface SessionWebhookResponse {
	/** Session UUID */
	uuid: string;
	/** Current transaction status */
	status: TransactionStatus;
	/** Complete session information */
	session: Session;
}

The webhook payload includes:

• uuid: Session UUID
• status: Current transaction status with type, status value, and optional transaction hash
• session: Complete session details including product info, price, customer UUID, etc.

Error Handling

The SDK provides specific error classes for different scenarios:

import {
	NotFoundException,
	UnauthorizedException,
	ValidationException,
	NetworkException,
	QBitFlowError,
} from 'qbitflow';

try {
	const payment = await client.oneTimePayments.get('invalid-uuid');
} catch (error) {
	if (error instanceof NotFoundException) {
		console.error('Payment not found');
	} else if (error instanceof UnauthorizedException) {
		console.error('Invalid API key');
	} else if (error instanceof ValidationException) {
		console.error('Invalid request:', error.message);
	} else if (error instanceof NetworkException) {
		console.error('Network error:', error.message);
	} else if (error instanceof QBitFlowError) {
		console.error('QBitFlow error:', error.message);
	} else {
		console.error('Unknown error:', error);
	}
}

API Reference

QBitFlow

Main client class.

Constructor

new QBitFlow(apiKey: string)
new QBitFlow(config: QBitFlowConfig)

Properties

• customers: CustomerRequests - Customer operations
• products: ProductRequests - Product operations
• users: UserRequests - User operations
• apiKeys: ApiKeyRequests - API key operations
• oneTimePayments: PaymentRequests - One-time payment operations
• subscriptions: SubscriptionRequests - Subscription operations
• payAsYouGo: PayAsYouGoRequests - Pay-as-you-go operations
• transactionStatus: TransactionStatusRequests - Transaction status operations

Testing

Run the test suite:

# Run all tests
npm test

# Run tests in watch mode
npm run test:watch

# Run tests with coverage
npm run test:coverage

License

This project is licensed under the MPL-2.0 License - see the LICENSE file for details.

Support

• 📖 Documentation
• 📧 Email Support
• 🐛 Issue Tracker

Changelog

See CHANGELOG.md for version history and updates.

Security

For security issues, please email [email protected] instead of using the issue tracker.

Made with ❤️ by the QBitFlow team