Add another user role based on a defined input field in WordPress (Woocommerce)

Add the following code snippet to your WordPress theme’s functions.php file.

Define the new user role and capabilities (you can customize this based on your needs)

function add_custom_roles() {
    add_role( 'corporate_customer', 'Corporate Customer', array(
        'read' => true,
        'edit_posts' => true,
        'delete_posts' => false,
    ));
}
add_action( 'init', 'add_custom_roles' );

A function to update the user role based on the custom field value

function custom_user_role_based_on_tax_number( $user_id ) {
    // Get the user's billing tax number from the user meta
    $billing_tax_number = get_user_meta( $user_id, 'billing_eu_vat_number', true );
    // Check if the user has entered a tax number
    if ( ! empty( $billing_tax_number ) ) {
        // Add the custom user role 'corporate_customer'
        $user = new WP_User( $user_id );
        $user->add_role( 'corporate_customer' );
    }
}
add_action( 'woocommerce_created_customer', 'custom_user_role_based_on_tax_number' );

When a customer registers and enters a tax number in their billing address during the WooCommerce checkout process, they will be assigned the custom user role ‘corporate_customer’.

Please note that this code assumes that you have a custom user meta field with the meta key ‘billing_eu_vat_number’ in the user’s profile. If you don’t have this field, you will need to add as user meta.

Hope this will help!