Originally Posted by
PLeblond
I am not familiar with every country's rules, but I do wonder if this is a case of 'without one's consent' or perhaps a retailer's preference to charge in the currency their payment processing system deems best? Additionally, are we certain this is imposed by the airline? Or is the bank that issued the card forcing the transaction into the local currency at their preferred rate? This practice sounds to me like something a bank would do.
Is there some sort of rule that requires a retailer to offer payment in a specific currency? Yes, some retailers offer at the time of payment what currency, but is this an obligation?
You can charge people in whatever currency you want, but you must do so with customer's consent. The issue here is that TAP quotes price in euros but their payment system applies DCC to convert this into AUD without even asking the customer, let alone requiring their approval. This is illegal because the customer never agreed to pay e.g. 190 AUD instead of 100 EUR. They agreed to pay those 100 EUR and the merchant can't just change the price because they feel like it.
DCC can only ever be used if customer agrees to it.