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add_filter( 'wpas_get_custom_fields', 'wpas_make_product_required' );
* Make the products field required
* @param array $custom_fields Registered custom fields
* @return array
function wpas_make_product_required( $custom_fields ) {
if ( isset( $custom_fields['product'] ) ) {
$custom_fields['product']['args']['required'] = true;
return $custom_fields;
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