how to insert textbox in checkout page
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how to insert textbox in checkout page right my design please tell me code <filter / action>

Hello,
In order to create the textbox on the checkout page, try to add this code to the functions.php file in your child theme.
if ( ! function_exists('wd_add_field_to_order_page') ) {
function wd_add_field_to_order_page(){
echo '<p class="woocommerce-billing-fields">';
echo '<a href="#" class="btn btn-color-primary btn-style-link btn-shape-rectangle btn-size-default">Get code from link</a>';
echo '</p>';
}
add_action( 'woocommerce_review_order_before_payment', 'wd_add_field_to_order_page', 10 );
}
https://gyazo.com/7ad183fd15f11f4d7d8281a7a9baefc1
Kind Regards
I want to get the value(affiliate name in that textbox)
or can you help me I bought sumo affiliate plugin but he reply very slow.
This plugin has select affiliate(textbox that I want)
When I come to the checkout page, there is a select affiliate as shown in the first picture.

But if pressed from this affiliate link
https://natnae.com/ref/chet4mk
select affiliate will hide

I already request support that I want it to stay and be famous. hold chet4mk(affilaite name) and send it with billing information
I would like to ask you to check that custom field why it hide when clicking on affiliate link.
pleaseeeeeee
tell me how to custom woocommerce like above help me please
best regard
Hello,
Unfortunately, such customization is not included in our support.
You can get acquainted with Envato Support Policy here:
https://themeforest.net/page/item_support_policy
Kind Regards