pressable_api_connection.php

<?php
/*
Plugin Name: Query Pressable API
Description: Demonstrating how to access the Pressable API using a simple WordPress plugin with settings page
Plugin URI:  https://pressable.com/
Author:      Pressable.com, tarhe
Version:     1.0
*/

// If this file is accessed directly, abort!
defined('ABSPATH') or die('Unauthorized Access');

/**
 * Register settings for storing API credentials and request details.
 */
function pressable_api_register_settings() {
    register_setting('pressable_api_options_group', 'pressable_api_client_id');
    register_setting('pressable_api_options_group', 'pressable_api_client_secret');
    register_setting('pressable_api_options_group', 'pressable_api_url');
    register_setting('pressable_api_options_group', 'pressable_api_method');
}
add_action('admin_init', 'pressable_api_register_settings');

/**
 * Add a settings page under "Settings".
 */
function pressable_api_settings_menu() {
    add_options_page(
        'Pressable API Settings',
        'Pressable API',
        'manage_options',
        'pressable-api-settings',
        'pressable_api_settings_page'
    );
}
add_action('admin_menu', 'pressable_api_settings_menu');

/**
 * Render the settings page.
 */
function pressable_api_settings_page() {
    ?>
    <div class="wrap">
        <h1>Pressable API Settings</h1>
        <form method="post" action="options.php">
            <?php settings_fields('pressable_api_options_group'); ?>
            <?php do_settings_sections('pressable_api_options_group'); ?>

            <table class="form-table">
                <tr>
                    <th scope="row">Client ID</th>
                    <td><input type="text" name="pressable_api_client_id" value="<?php echo esc_attr(get_option('pressable_api_client_id')); ?>" class="regular-text" /></td>
                </tr>
                <tr>
                    <th scope="row">Client Secret</th>
                    <td><input type="password" name="pressable_api_client_secret" value="<?php echo esc_attr(get_option('pressable_api_client_secret')); ?>" class="regular-text" /></td>
                </tr>
                <tr>
                    <th scope="row">API Request URL</th>
                    <td><input type="url" name="pressable_api_url" value="<?php echo esc_attr(get_option('pressable_api_url')); ?>" class="regular-text" /></td>
                </tr>
                <tr>
                    <th scope="row">Request Method</th>
                    <td>
                        <select name="pressable_api_method">
                            <option value="GET" <?php selected(get_option('pressable_api_method'), 'GET'); ?>>GET</option>
                            <option value="POST" <?php selected(get_option('pressable_api_method'), 'POST'); ?>>POST</option>
                            <option value="PUT" <?php selected(get_option('pressable_api_method'), 'PUT'); ?>>PUT</option>
                        </select>
                    </td>
                </tr>
            </table>

            <?php submit_button('Save Settings'); ?>
        </form>

        <?php if ( get_option('pressable_api_client_id') && get_option('pressable_api_client_secret') && get_option('pressable_api_url') ) : ?>
            <hr/>
            <form method="post">
                <?php wp_nonce_field('pressable_api_test_nonce', 'pressable_api_test_nonce_field'); ?>
                <input type="hidden" name="pressable_api_action" value="test_api_request" />
                <?php submit_button('Test API Request', 'secondary'); ?>
            </form>
        <?php endif; ?>
    </div>
    <?php
}

/**
 * Authenticate and request data from Pressable API.
 */
function pressable_api_get_send_data() {
    $client_id     = get_option('pressable_api_client_id');
    $client_secret = get_option('pressable_api_client_secret');
    $api_url       = get_option('pressable_api_url');
    $method        = strtoupper(get_option('pressable_api_method', 'GET'));

    if (!$client_id || !$client_secret || !$api_url) {
        echo '<div class="notice notice-error"><p>Please configure your API settings first.</p></div>';
        return;
    }

    // Check if token exists and not expired
    $access_token = get_transient('pressable_access_token');
    if (!$access_token) {
        $response = wp_remote_post('https://my.pressable.com/auth/token', array(
            'body' => array(
                'client_id'     => $client_id,
                'client_secret' => $client_secret,
                'grant_type'    => 'client_credentials',
            ),
        ));

        if (is_wp_error($response)) {
            echo '<div class="notice notice-error"><p>Token request failed: ' . esc_html($response->get_error_message()) . '</p></div>';
            return;
        }

        $body = json_decode(wp_remote_retrieve_body($response), true);
        if (empty($body['access_token'])) {
            echo '<div class="notice notice-error"><p>Failed to retrieve access token. Check your credentials.</p></div>';
            return;
        }

        $access_token = $body['access_token'];
        set_transient('pressable_access_token', $access_token, $body['expires_in']);
    }

    // Build request args
    $args = array(
        'headers' => array(
            'Authorization' => 'Bearer ' . $access_token,
        ),
        'method'  => $method,
    );

    // Example payload for POST/PUT
    if ($method === 'POST' || $method === 'PUT') {
        $args['body'] = array(
            'example_key' => 'example_value',
        );
    }

    $request = wp_remote_request($api_url, $args);

    if (is_wp_error($request)) {
        echo '<div class="notice notice-error"><p>API request failed: ' . esc_html($request->get_error_message()) . '</p></div>';
        return;
    }

    $results = json_decode(wp_remote_retrieve_body($request), true);

    echo '<div class="notice notice-info" style="padding:15px; margin-top:20px;">';
    echo '<h2>Pressable API Response</h2><pre>';
    print_r($results);
    echo '</pre></div>';
}

/**
 * Handle "Test API Request" button action.
 */
add_action('admin_init', function() {
    if ( isset($_POST['pressable_api_action']) && $_POST['pressable_api_action'] === 'test_api_request' ) {
        if ( ! isset($_POST['pressable_api_test_nonce_field']) ||
             ! wp_verify_nonce($_POST['pressable_api_test_nonce_field'], 'pressable_api_test_nonce') ) {
            wp_die('Security check failed');
        }

        add_action('admin_notices', function() {
            pressable_api_get_send_data();
        });
    }
});