Step by Step Guide to Building a Wave API Integration in PHP

Introduction

Hey there, fellow developer! Ready to dive into the world of Wave API integration? You're in for a treat. Wave's API is a powerful tool that'll let you tap into their financial services, and we're going to build that integration using PHP. Buckle up!

Prerequisites

Before we jump in, make sure you've got:

• A PHP environment up and running
• Wave API credentials (if you don't have these yet, head over to Wave's developer portal)
• Guzzle installed (we'll use this for making HTTP requests)

Got all that? Great! Let's get our hands dirty.

Setting up the project

First things first, let's set up our project structure. Create a new directory for your project and initialize Composer:

mkdir wave-api-integration
cd wave-api-integration
composer init

Now, let's install Guzzle:

composer require guzzlehttp/guzzle

Authentication

Wave uses OAuth 2.0 for authentication. Here's how to get your access token:

use GuzzleHttp\Client;

$client = new Client();
$response = $client->post('https://api.waveapps.com/oauth2/token/', [
    'form_params' => [
        'client_id' => 'YOUR_CLIENT_ID',
        'client_secret' => 'YOUR_CLIENT_SECRET',
        'grant_type' => 'client_credentials'
    ]
]);

$token = json_decode($response->getBody(), true)['access_token'];

Pro tip: Implement a token refresh mechanism to keep your integration running smoothly.

Making API requests

Now that we're authenticated, let's make some requests:

$client = new Client([
    'base_uri' => 'https://api.waveapps.com/v1/',
    'headers' => [
        'Authorization' => 'Bearer ' . $token,
        'Accept' => 'application/json'
    ]
]);

$response = $client->get('customers');
$customers = json_decode($response->getBody(), true);

Implementing key Wave API endpoints

Let's implement some key endpoints:

Customers

// Get all customers
$response = $client->get('customers');

// Create a new customer
$response = $client->post('customers', [
    'json' => [
        'name' => 'John Doe',
        'email' => '[email protected]'
    ]
]);

Invoices

// Get all invoices
$response = $client->get('invoices');

// Create a new invoice
$response = $client->post('invoices', [
    'json' => [
        'customer_id' => 'CUSTOMER_ID',
        'items' => [
            [
                'product_id' => 'PRODUCT_ID',
                'quantity' => 1,
                'price' => 100.00
            ]
        ]
    ]
]);

Error handling and logging

Always expect the unexpected! Implement robust error handling:

try {
    $response = $client->get('customers');
} catch (\GuzzleHttp\Exception\ClientException $e) {
    $errorResponse = $e->getResponse();
    $errorBody = json_decode($errorResponse->getBody(), true);
    // Log the error
    error_log('Wave API Error: ' . $errorBody['message']);
}

Testing the integration

Don't forget to test your integration thoroughly. Use Wave's sandbox environment for testing, and implement unit tests for your key components.

Best practices and optimization

Keep these in mind:

• Respect Wave's rate limits
• Implement caching where appropriate
• Use webhook events for real-time updates

Conclusion

And there you have it! You've just built a Wave API integration in PHP. Pretty cool, right? Remember, this is just the beginning. There's a whole world of financial data at your fingertips now. Go forth and build something awesome!

For more details, check out Wave's API documentation. Happy coding!