I shared expenses 50/50 with a friend on vacation. She wants me to split the cost of her credit card's foreign-transaction fees. Is that sharp practice?

https://www.msn.com/en-us/travel/news/i-shared-expenses-50-50-with-a-friend-on-vacation-she-wants-me-to-split-the-cost-of-her-credit-card-s-foreign-transaction-fees-is-that-sharp-practice/ar-AA11ihR3?li=BBnbklE