See here the daily Visa Interchange Rates compared to the market rates. This data is based on a European USD Visa debit/credit card. Each field represents the converted foreign value for 1 US dollar. Updated: Feb 17, 2018.
|CNY||China Yuan Renminbi||6.347||6.645||4.49%|
|NZD||New Zealand Dollar||1.353||1.451||6.72%|
|HKD||Hong Kong Dollar||7.821||7.798||-0.3%|
|KRW||South Korean Won||1066.6||N/A||N/A|
|ZAR||South African Rand||11.627||14.018||17.05%|
It's simple, Visa makes money every time you swipe your Visa credit card. VISA process the transaction between the shop and the bank. Every transaction has a tiny "interchange" fee for VISA. This fee is sometimes shared with the your bank.
Every time you use your Visa card for another currency, there is a foreign transaction fee attached to it. It all depends on your banks fee structure. Most of the times you will be paying 2-3% on top of the Visa interchange rate.
Visa Inc. was founded in 1958 as BankAmericard. Visa Inc. has more than 11.0000 employees around the world. Visa does not issue cards, but makes products for the banks to make global card and payment transactions easy.