I'm creating a WP plugin to integrate woocommerce and dynamics business central DBC to sync data between the two platforms. The plugin has two files, below is my plugin main file, also pasted on the editor <?php /** * Plugin Name: WooKomasBCentral

					<?php
/**
 * Plugin Name: WooKomasBCentral Sync
 * Plugin URI: https://dottlinks.co.ke/
 * Description: Sync all WooCommerce sales data, orders data, inventory data, purchase history, and user data with Microsoft Dynamics NAV/business central.
 * Author: Dottlinks Services
 * Version: 4.2.0
 * Author URI: https://dottlinks.co.ke/
 * Text Domain: wookomas_bcentral_sync
 */

defined( 'ABSPATH' ) || exit; // Prevents direct access to the plugin file

// Add plugin menu page
function wpturbo_wookomas_add_menu_page() {
    add_menu_page(
        esc_html__( 'WooKomas Sync Settings', 'wookomas_bcentral_sync' ),
        esc_html__( 'WooKomas Sync', 'wookomas_bcentral_sync' ),
        'manage_options',
        'wookomas-sync',
        'wpturbo_wookomas_display_settings_page',
        'dashicons-update',
        30
    );
}
add_action( 'admin_menu', 'wpturbo_wookomas_add_menu_page' );

// Add plugin settings page
function wpturbo_wookomas_display_settings_page() {
    ?>
    <div class="wrap">
        <h1><?php esc_html_e( 'WooKomas Sync Settings', 'wookomas_bcentral_sync' ); ?></h1>
        <?php settings_errors(); ?>
        <form method="post" action="options.php">
            <?php settings_fields( 'wookomas_sync_settings' ); ?>
            <?php do_settings_sections( 'wookomas-sync' ); ?>
            <?php submit_button(); ?>
        </form>

        <h2><?php esc_html_e( 'Test Connection', 'wookomas_bcentral_sync' ); ?></h2>
        <?php wpturbo_wookomas_test_connection_form(); ?>
        <div id="wookomas-test-connection-result"></div>
    </div>
    <?php
}

// Register plugin settings
function wpturbo_wookomas_register_settings() {
    // Add 'API Credentials' section to settings page
    add_settings_section(
        'wookomas_sync_api',
        esc_html__( 'API Credentials', 'wookomas_bcentral_sync' ),
        'wpturbo_wookomas_output_api_section',
        'wookomas-sync'
    );

    // Add 'Client ID' field to 'API Credentials' section
    add_settings_field(
        'wookomas_sync_client_id',
        esc_html__( 'Client ID', 'wookomas_bcentral_sync' ),
        'wpturbo_wookomas_output_client_id_field',
        'wookomas-sync',
        'wookomas_sync_api'
    );

    // Add 'Client Secret' field to 'API Credentials' section
    add_settings_field(
        'wookomas_sync_client_secret',
        esc_html__( 'Client Secret', 'wookomas_bcentral_sync' ),
        'wpturbo_wookomas_output_client_secret_field',
        'wookomas-sync',
        'wookomas_sync_api'
    );

    // Register 'Client ID' and 'Client Secret' settings
    register_setting(
        'wookomas_sync_settings',
        'wookomas_sync_client_id',
        array(
            'type' => 'string',
            'sanitize_callback' => 'sanitize_text_field',
            'show_in_rest' => true,
            'default' => '',
        )
    );
    register_setting(
        'wookomas_sync_settings',
        'wookomas_sync_client_secret',
        array(
            'type' => 'string',
            'sanitize_callback' => 'sanitize_text_field',
            'show_in_rest' => true,
            'default' => '',
        )
    );
}
add_action( 'admin_init', 'wpturbo_wookomas_register_settings' );

// Output 'API Credentials' section
function wpturbo_wookomas_output_api_section() {
    echo '<p>' . esc_html__( 'Enter your Microsoft Dynamics NAV/business central API credentials below.', 'wookomas_bcentral_sync' ) . '</p>';
}

// Output 'Client ID' field
function wpturbo_wookomas_output_client_id_field() {
    $client_id = get_option( 'wookomas_sync_client_id', '' );
    echo '<input type="text" name="wookomas_sync_client_id" value="' . esc_attr( $client_id ) . '" />';
}

// Output 'Client Secret' field
function wpturbo_wookomas_output_client_secret_field() {
    $client_secret = get_option( 'wookomas_sync_client_secret', '' );
    echo '<input type="text" name="wookomas_sync_client_secret" value="' . esc_attr( $client_secret ) . '" />';
}

// Output 'Test Connection' form
function wpturbo_wookomas_test_connection_form() {
    ?>
    <button type="button" class="button" id="wookomas-test-connection-button">
        <?php esc_html_e( 'Test Connection', 'wookomas_bcentral_sync' ); ?>
    </button>
    <?php
}

// Handle 'Test Connection' AJAX request
function wpturbo_wookomas_handle_test_connection() {
    if ( ! isset( $_POST['client_id'] ) || ! isset( $_POST['client_secret'] ) ) {
        wp_send_json_error( __( 'Missing API credentials.', 'wookomas_bcentral_sync' ) );
        wp_die();
    }

    // Retrieve API credentials
    $client_id = sanitize_text_field( $_POST['client_id'] );
    $client_secret = sanitize_text_field( $_POST['client_secret'] );

    // Perform data sync
    $url = 'https://api.businesscentral.dynamics.com/v2.0/dottlinks.co.ke/production'; // Replace with actual URL
    $data = array(
        'action' => 'sync_data',
        'client_id' => $client_id,
        'client_secret' => $client_secret,
    );
    $response = wp_remote_request(
        $url,
        array(
            'body' => $data,
            'timeout' => 30,
            'headers' => array(
                'Content-Type' => '