Technically the system is designed such that the CC company knows nothing of the receipt and the merchant knows nothing of the buyer.
If you're using a store card, the merchant == the CC company and so knows everything about you anyways.
If you're not using the store card, the merchant probably has an agreement with the CC company to share the information, so the technical implementation is irrelevant.
If you're using a store card, the merchant == the CC company and so knows everything about you anyways.
If you're not using the store card, the merchant probably has an agreement with the CC company to share the information, so the technical implementation is irrelevant.