how to access items within the basket

That won't work well. For instance manual refund have no parent_txn_id

I was thinking about using reason_code ? Do you have a defined list for this field ?

What do you mean manual refund? Are you refunding from within CBSubs or from within the payment gateway? In all cases parent_txn_id should be set to the transaction it's refunding. reason_code is typically only used for storing API response reasons and isn't used in most gateways so it's of no use for what you're trying to do. You'd use payment_status if you're just trying to check if it's a refund or not since payment_status should be set to Refunded or Partially-Refunded for partial refunds.

OK I think we made something usable for Invoice Manager
It is lacking some options to cover the use of invoice template in case of a refund (in our case we use template #3 for credit notes) and it could be enhanced but it does the main job
Hope it could help someone or maybe a starting point for you


Thanks for the help