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Example implementation for a hidden field as WooCommerce product meta field, in the "General" tab.
function prefix_add_hidden_input() {
$args = array(
'value' => '', // meta_value, meta_key is the id
'class' => '',
'id' => '' // required, makes the meta_key for storing the value
woocommerce_wp_hidden_input( $args );
add_action( 'woocommerce_product_options_tax', 'prefix_add_hidden_input' );
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