Related Receipts

I think there needs to be a way to relate receipts. For example, your own subscription generates a receipt from SparkReceipt as well as one from Paddle. I feel it is important to keep both but have the receipts joined. There are other products that generate two receipts - one from the vendor system and one from the subscription management system. It is important to be able to find the subscription via both vendors. I suspect there are other use cases for the ability to merge receipts also.