add_settings_field (

                'WhattsApp_Advance_Pages_fld', // ID used to identify the field throughout the theme 

                esc_html__('Where you Want To display?', 'Woo-WhattsApp'), // The label to the left of the option interface element

                array($this, 'WhatsApp_Advance_Pages_Callback'),   // The name of the function responsible for rendering the option interface  

                'WhatsApp_Advance_Settings_page', // The page on which this option will be displayed 

                'WhatsApp_Advance_Settings' // The name of the section to which this field belongs
                              
            );  

            register_setting( 

                'WhatsApp_Advance_Settings',

                'WhattsApp_Advance_Pages_fld'

            );


//CallBack function
public function WhatsApp_Advance_Pages_Callback() {

            ?>

 <select name="WhattsApp_Advance_Pages_fld" id="WhattsApp_Advance_Pages_fld" data-placeholder="Choose Pages..." class="chosen-select" multiple="" tabindex="-1">;
                                <option value="all" <?php ( "all")   ?>
                                >
                                    <?php echo esc_html__("All", 'Woo-WhattsApp'); ?>
                                </option>
                                <option value="Shop" <?php echo esc_attr(get_option('WhattsApp_Advance_Pages_fld')); ?>
                                    >
                                    <?php echo esc_html__("Shop", 'Woo-WhattsApp'); ?>

                                </option>
                                <option value="Product" <?php echo esc_attr(get_option('WhattsApp_Advance_Pages_fld'));  ?>
                                    >
                                    <?php echo esc_html__("Product", 'Woo-WhattsApp'); ?>
                                </option>

                                 <option value="product-category" <?php echo esc_attr(get_option('WhattsApp_Advance_Pages_fld'));  ?>
                                    >
                                    <?php echo esc_html__("product-category", 'Woo-WhattsApp'); ?>
                                </option>
                                 <option value="Products taggs" <?php ( "Products taggs")  ?>
                                    >
                                    <?php echo esc_html__("Products-taggs", 'Woo-WhattsApp'); ?>
                                </option>

                            </select>

            

            <?php

        }