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I am using this code in my functions.php file. User is being added to the list, but the Interest Group is not updating in Mailchimp
/**
* This snippet adds the HTML for a MailChimp interest groups to your WooCommerce checkout.
*/
add_action( 'woocommerce_review_order_before_submit', 'mc4wp_show_interest_group_in_checkout' );
function mc4wp_show_interest_group_in_checkout() { ?>
<!-- Interest Groups -->
<input name="mc4wp-INTERESTS[73c469e797][]" type="hidden" value="399d2b00e5" />
<?php
}
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