USPS OAuth PHP Library

Modern PHP library for the USPS OAuth 2.0 API (2026+). Get real-time shipping rates, generate labels, and track packages using the latest USPS Web Tools API v3.

Why this library?

• ✅ OAuth 2.0 - Uses the new USPS API (2026+ ready)
• ✅ Modern PHP - PHP 8.1+ with type safety
• ✅ Framework Agnostic - Works with any PHP project
• ✅ PSR Compatible - PSR-4 autoloading, PSR-3 logging
• ✅ Well Tested - Comprehensive unit tests
• ✅ Production Ready - Used in commercial applications

Installation

composer require mmediasoftwarelab/usps-oauth-php

Requirements

• PHP 8.1 or higher
• ext-json
• ext-curl
• ext-openssl (for HTTPS requests)
• ext-mbstring (recommended)
• Valid USPS Business Account with API credentials

Getting USPS API Credentials

1. Create a USPS Business Account at USPS.com
2. Request API access through the USPS Web Tools portal
3. You'll receive a Client ID and Client Secret for OAuth authentication

Environment Setup

For development and testing, create a .env file:

cp .env.example .env

Add your credentials:

USPS_CLIENT_ID=your-client-id-here
USPS_CLIENT_SECRET=your-client-secret-here
USPS_SANDBOX=true

Note: Never commit .env to version control. It's already in .gitignore.

Quick Start

<?php
require 'vendor/autoload.php';

use MMedia\USPS\Client;
use MMedia\USPS\Rates\DomesticRates;

// Initialize client
$client = new Client(
    clientId: 'your-client-id',
    clientSecret: 'your-client-secret',
    sandbox: true // Use sandbox for testing
);

// Get domestic shipping rates
$domesticRates = new DomesticRates($client);

$rate = $domesticRates->getRate(
    originZip: '90210',
    destinationZip: '10001',
    weightLbs: 2.5,
    length: 12,
    width: 8,
    height: 6,
    serviceType: 'USPS_GROUND_ADVANTAGE'
);

echo "Shipping cost: $" . $rate->getTotalPrice();

Features

Domestic Shipping Rates

use MMedia\USPS\Rates\DomesticRates;
use MMedia\USPS\Enums\DomesticServiceType;

$rates = new DomesticRates($client);

// Get rate for specific service
$rate = $rates->getRate(
    originZip: '90210',
    destinationZip: '10001',
    weightLbs: 2.5,
    length: 12,
    width: 8,
    height: 6,
    serviceType: DomesticServiceType::GROUND_ADVANTAGE
);

// Or get all available services
$allRates = $rates->getAllRates(
    originZip: '90210',
    destinationZip: '10001',
    weightLbs: 2.5,
    length: 12,
    width: 8,
    height: 6
);

foreach ($allRates as $service => $rate) {
    echo "{$service}: $" . $rate->getTotalPrice() . "\n";
}

International Shipping Rates

use MMedia\USPS\Rates\InternationalRates;
use MMedia\USPS\Enums\InternationalServiceType;

$rates = new InternationalRates($client);

$rate = $rates->getRate(
    originZip: '90210',
    destinationCountry: 'CA', // Canada
    weightLbs: 2.5,
    length: 12,
    width: 8,
    height: 6,
    serviceType: InternationalServiceType::PRIORITY_MAIL_INTERNATIONAL
);

Supported Services

Domestic:

• USPS Ground Advantage
• Priority Mail
• Priority Mail Express
• Media Mail
• First-Class Package

International:

• Priority Mail International
• Priority Mail Express International
• First-Class Package International

Configuration

Sandbox vs Production

// Development/Testing
$client = new Client(
    clientId: 'sandbox-client-id',
    clientSecret: 'sandbox-secret',
    sandbox: true
);

// Production
$client = new Client(
    clientId: 'production-client-id',
    clientSecret: 'production-secret',
    sandbox: false
);

Custom HTTP Client

use MMedia\USPS\Http\CurlHttpClient;

$httpClient = new CurlHttpClient(
    timeout: 30,
    connectTimeout: 10
);

$client = new Client(
    clientId: 'your-client-id',
    clientSecret: 'your-client-secret',
    httpClient: $httpClient
);

Logging

use Monolog\Logger;
use Monolog\Handler\StreamHandler;

$logger = new Logger('usps');
$logger->pushHandler(new StreamHandler('usps.log', Logger::DEBUG));

$client = new Client(
    clientId: 'your-client-id',
    clientSecret: 'your-client-secret',
    logger: $logger
);

Framework Integration

Laravel

// In a service provider
use MMedia\USPS\Client;

$this->app->singleton(Client::class, function ($app) {
    return new Client(
        clientId: config('services.usps.client_id'),
        clientSecret: config('services.usps.client_secret'),
        sandbox: config('services.usps.sandbox', true),
        logger: $app->make('log')
    );
});

Symfony

# config/services.yaml
services:
  MMedia\USPS\Client:
    arguments:
      $clientId: "%env(USPS_CLIENT_ID)%"
      $clientSecret: "%env(USPS_CLIENT_SECRET)%"
      $sandbox: "%env(bool:USPS_SANDBOX)%"
      $logger: "@logger"

WordPress/WooCommerce

See the WordPress Adapter for WooCommerce integration.

Error Handling

use MMedia\USPS\Exceptions\AuthenticationException;
use MMedia\USPS\Exceptions\RateException;
use MMedia\USPS\Exceptions\ValidationException;

try {
    $rate = $domesticRates->getRate(
        originZip: '90210',
        destinationZip: '10001',
        weightLbs: 2.5,
        length: 12,
        width: 8,
        height: 6,
        serviceType: 'USPS_GROUND_ADVANTAGE'
    );
} catch (AuthenticationException $e) {
    // OAuth token failed - check credentials
    error_log("Authentication failed: " . $e->getMessage());
} catch (ValidationException $e) {
    // Invalid input data
    error_log("Validation error: " . $e->getMessage());
} catch (RateException $e) {
    // Rate calculation failed
    error_log("Rate error: " . $e->getMessage());
}

Testing

This library has comprehensive test coverage with unit and integration tests.

# Run all tests
composer test

# Run with coverage report
vendor/bin/phpunit --coverage-html coverage

# Run only unit tests
vendor/bin/phpunit --testsuite="USPS OAuth PHP Test Suite"

# Run integration tests (requires USPS credentials)
USPS_CLIENT_ID=xxx USPS_CLIENT_SECRET=yyy vendor/bin/phpunit --testsuite=integration

# Run static analysis (PHPStan level 8)
composer phpstan

# Check code style (PSR-12)
composer phpcs

Test Coverage: 90%+ code coverage with automated CI/CD testing on PHP 8.1, 8.2, and 8.3.

See TESTING.md for detailed testing documentation.

Documentation

• QUICKSTART.md - Quick start guide and overview
• TESTING.md - Comprehensive testing guide
• MONETIZATION_STRATEGY.md - Business model and revenue strategy
• LICENSING_IMPLEMENTATION.md - Premium features licensing guide
• CONTRIBUTING.md - How to contribute

API Documentation

For detailed USPS API documentation, visit:

• USPS Developer Portal
• OAuth 2.0 Guide
• Pricing API v3

Examples

Check the examples directory for:

• Basic usage
• Laravel integration
• Symfony integration
• WordPress/WooCommerce adapter
• Custom HTTP client
• Error handling patterns

Premium Features 💎

Looking for advanced features? Check out USPS OAuth PHP Pro:

• 🏷️ Label Generation - PDF, PNG, and ZPL formats
• 📦 Package Tracking - Real-time tracking with webhooks
• 📊 Multi-Carrier - Compare rates across USPS, UPS, FedEx
• ⚡ Rate Caching - Redis/Memcached integration
• 🔄 Batch Operations - Process thousands of shipments
• 💳 Commercial Support - Priority support and SLA

Learn more about Pro features →

Framework Integrations

• WooCommerce Plugin - $149
• Laravel Package - Coming Q2 2026
• Symfony Bundle - Coming Q2 2026
• Magento Extension - Coming Q3 2026
• Shopify App - Coming Q3 2026

Contributing

We welcome contributions! Please see CONTRIBUTING.md for details.

Security

If you discover any security issues, please email security@mmediasoftwarelab.com instead of using the issue tracker.

License

The MIT License (MIT). Please see LICENSE for more information.

Credits

Developed by M Media

Support

• Email: info@mmediasoftwarelab.com
• Issues: GitHub Issues
• Discussions: GitHub Discussions
• Commercial Support: Contact Sales
• Documentation: Full Documentation