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To create custom fields that retrieve information from ACF (advanced custom field) you need to use the_field function. An easy template that you can use is this one:

Getting Order ACF

return get_field('your_field_name',$order->get_id());

Replace “your_field_name” for the name/id (not the label) of the field that you want to retrieve, example:

Getting Product ACF

Getting the product field is a little more tricky but can be done with this code

$product=$item->get_product();
 if($product==null)
   return '';
 if($product->is_type('variation'))
   $product=wc_get_product($product->get_parent_id());
 return get_field('your_field_name',$product->get_id());