What is a credit card TXN?

Could you please clarify what exactly you mean by "credit card TXN"? Are you referring to a transaction (TXN) made using a credit card? If so, a credit card transaction is simply a purchase or payment made using a credit card, where the cardholder is borrowing money from the card issuer to pay for the goods or services. The transaction is processed through the credit card network, and the funds are typically transferred from the merchant's account to the card issuer's account, with the cardholder responsible for repaying the amount borrowed, plus any applicable interest and fees. Is there anything else you would like to know about credit card transactions?