Send inquiry button code using contact form and popup maker in wordpress

add this code in your theme functions.php

//Custom Code
//send inquiry contactform tab on product detail page
//add_filter( 'woocommerce_product_tabs', 'product_enquiry_tab' );

function product_enquiry_tab( $tabs ) {
    $tabs['test_tab'] = array(
        'title'     => __( 'Send Inquiry', 'woocommerce' ),
        'priority'  => 50,
        'callback'  => 'product_enquiry_tab_form'
    );
    return $tabs;
}

function product_enquiry_tab_form() {
    global $product;
    //If you want to have product ID also
    //$product_id = $product->id;
    $subject    =   "Enquire about ".$product->post->post_title;
    echo "<h3>".$subject."</h3>";
    echo do_shortcode('[contact-form-7 id="3319" title="popup form"]'); //add your contact form shortcode here ..
    ?>
    <script>
    (function($){
        $(".product_name").val("<?php echo $subject; ?>");
    })(jQuery);
    </script> 
    <?php 
}

//send inquiry button on product page

add_filter( 'woocommerce_loop_add_to_cart_link', 'replacing_add_to_cart_button', 10, 2 );
function replacing_add_to_cart_button( $button, $product  ) {
    $button_text = __("Send Inquiry", "woocommerce");
    $subject = $product->post->post_title;
    $button = '<a class="button product_send_inquiry_btn" data-title="'.$subject.'" href="' . $product->get_permalink() . '">' . $button_text . '</a>';

    return $button;
}

//send inquiry button on product detail page

add_action( 'woocommerce_single_product_summary', 'my_extra_button_on_product_page', 36);
function my_extra_button_on_product_page() {
  global $product,$post;
  $button_text = __("Send Inquiry", "woocommerce");
    $subject = get_post_field('post_title', $post->ID);
    $button = '<a class="button product_send_inquiry_btn" data-title="'.$subject.'" >' . $button_text . '</a>';

    echo $button;
}

//get product name on button click script add in footer

add_action('wp_footer', 'add_send_btn_script');
function add_send_btn_script() {
    ?>
    <script>
    jQuery('.product_send_inquiry_btn').on('click', function (e) {
        e.preventDefault();
        var product_name = "Product Inquiry for "+jQuery(this).data('title');
        jQuery(".product_name").val(product_name);
    });
    </script>
    <?php
    return true;
}