WordPress QR Code Integration

// Add to your theme's functions.php
function qr_code_shortcode($atts) {
    $atts = shortcode_atts(array(
        'data' => get_permalink(),
        'size' => 200,
    ), $atts);

    $api_key = get_option('qr_api_key');
    
    $response = wp_remote_post('https://www.qrcodeapi.io/api/generate', array(
        'headers' => array(
            'Authorization' => 'Bearer ' . $api_key,
            'Content-Type' => 'application/json',
        ),
        'body' => json_encode(array(
            'data' => $atts['data'],
            'size' => (int) $atts['size'],
            'format' => 'png',
        )),
    ));

    if (is_wp_error($response)) {
        return '<p>Error generating QR code</p>';
    }

    $image = wp_remote_retrieve_body($response);
    $base64 = base64_encode($image);
    
    return '<img src="data:image/png;base64,' . $base64 . '" alt="QR Code" />';
}
add_shortcode('qrcode', 'qr_code_shortcode');

<!-- QR code for current page URL -->
[qrcode]

<!-- QR code for custom URL -->
[qrcode data="https://example.com"]

<!-- QR code with custom size -->
[qrcode data="https://example.com" size="400"]

// Add settings menu
function qr_api_settings_menu() {
    add_options_page(
        'QR Code API Settings',
        'QR Code API',
        'manage_options',
        'qr-api-settings',
        'qr_api_settings_page'
    );
}
add_action('admin_menu', 'qr_api_settings_menu');

function qr_api_settings_page() {
    if (isset($_POST['qr_api_key'])) {
        update_option('qr_api_key', sanitize_text_field($_POST['qr_api_key']));
    }
    $api_key = get_option('qr_api_key', '');
    ?>
    <div class="wrap">
        <h1>QR Code API Settings</h1>
        <form method="post">
            <table class="form-table">
                <tr>
                    <th>API Key</th>
                    <td><input type="text" name="qr_api_key" value="<?php echo esc_attr($api_key); ?>" class="regular-text" /></td>
                </tr>
            </table>
            <?php submit_button(); ?>
        </form>
    </div>
    <?php
}

function auto_add_qr_to_content($content) {
    if (is_single()) {
        $qr = do_shortcode('[qrcode size="150"]');
        $content .= '<div class="post-qr-code"><p>Scan to share:</p>' . $qr . '</div>';
    }
    return $content;
}
add_filter('the_content', 'auto_add_qr_to_content');