https://www.gemalto.com/financial/cards/payments/dynamic-code-verification https://www.gemalto.com/financial/cards/payments/dynamic-cod... Already used to make

https://www.gemalto.com/financial/cards/payments/dynamic-code-verification https://www.gemalto.com/financial/cards/payments/dynamic-cod... Already used to make dynamic CVV codes for cards which change every 30 minutes.