This tutorial shows how to configure eBay store settings using the eBay Trading API. Part 1 covered the developer dashboard and database setup; this part focuses on store settings, with Part 3 covering product additions.

Key Concepts:

• Leverage the eBay Trading API for efficient store configuration. Essential dependencies include the Slim framework, Guzzle for API interactions, and Twig for templating.
• Develop an Ebay class to streamline API requests, including session ID and user token management.
• Configure API calls correctly, including headers and XML body content.
• Utilize Twig templates with Bootstrap for a user-friendly store interface.
• Directly manage eBay store settings via the API, updating and retrieving preferences, shipping, and seller profiles.
• Thoroughly test API functionality in eBay's sandbox before live deployment.

Setting Up Dependencies:

Install necessary libraries using Composer. Create composer.json:

{
    "require": {
        "slim/slim-skeleton": "dev-master",
        "slimcontroller/slimcontroller": "dev-master",
        "guzzlehttp/guzzle": "4.*",
        "vlucas/valitron": "~1.2",
        "codeguy/upload": "*"
    },
    "autoload": {
      "classmap": [
        "controllers",
        "classes"
      ]
    }
}

This includes Slim (framework), SlimController (MVC support), Guzzle (HTTP client), Valitron (form validation), and Codeguy/Upload (file handling).

Create index.php:

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

$app = new \SlimController\Slim([
    'templates.path' => 'templates'
]);

$app->view(new \Slim\Views\Twig());
$app->view->parserOptions = [
    'charset' => 'utf-8',
    'cache' => realpath('templates/cache'),
    'auto_reload' => true,
    'strict_variables' => false,
    'autoescape' => true
];

$app->hook('slim.before', function () use ($app) {
    $app->view()->appendData(['baseUrl' => '/tester/ebay_trading_api']);
});

$app->container->singleton('ebay', function () use ($app) {
    $id = 1;
    $settings_result = $app->db->query("SELECT user_token, run_name, dev_id, app_id, cert_id, site_id FROM settings WHERE id = $id");
    $settings = $settings_result->fetch_object();
    return new Ebay($settings);
});

$app->container->singleton('db', function () {
    $server = 'localhost';
    $user = 'user';
    $pass = '';
    $database = 'ebaytrading';
    return new mysqli($server, $user, $pass, $database);
});


$app->addRoutes([
    '/' => 'Home:index',
    '/settings' => 'Settings:view',
    '/settings/update' => 'Settings:update',
    // ... other routes ...
]);

$app->run();

This sets up Slim, Twig templating, and database connection. The Ebay class (detailed below) is integrated into the container.

The Ebay Class (classes/Ebay.php):

<?php
class Ebay {
    public $compatability_level = 885;
    public $sandbox_url = 'https://api.sandbox.ebay.com/ws/api.dll';
    public $url = 'https://api.ebay.com/ws/api.dll';
    // ... other properties ...

    public function __construct($settings) {
        // ... property assignment ...
    }

    public function request($method, $request_body) {
        // ... Guzzle request handling ...
    }

    public function getSessionID() {
        // ... GetSessionID API call ...
    }

    public function getUserToken($session_id) {
        // ... FetchToken API call ...
    }

    public function getUserPreferences() {
        // ... GetUserPreferences API call and data processing ...
    }

    public function getEbayDetails($detail_name) {
        // ... GeteBayDetails API call and data processing ...
    }
}

This class encapsulates API interaction logic, including methods for getting session IDs, user tokens, user preferences, and eBay details. The request method handles the actual API calls using Guzzle.

Store Settings Controller (controllers/Settings.php):

<?php
class Settings extends \SlimController\SlimController {
    public function viewAction() {
        // ... Fetches user preferences, shipping services, and store settings from DB and API.  Renders 'settings/view.twig' ...
    }

    public function updateAction() {
        // ... Uses Valitron for validation, then updates store settings in the DB using prepared statements.  Handles success/failure messages and redirects ...
    }
}

This controller handles viewing and updating store settings. It interacts with the Ebay class and the database.

Templates (in templates directory):

• base.twig: Base layout using Bootstrap.
• settings/view.twig: Form for viewing and editing store settings.

Further Details:

The complete implementation involves detailed XML request bodies for API calls, error handling, form handling, and more. The provided snippets illustrate the core structure and interaction with the eBay Trading API. Remember to replace placeholder database credentials and API keys with your actual values. The FAQs at the end of the original input provide additional context and troubleshooting information.

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