Specific limitations when using Apple Pay depend on the country. In the UK, customers can now make purchases over £30 using Apple Pay. Most online casinos will allow Apple Pay deposits of £20 to £5,000, but this is not always the case. Many casinos have set a much lower maximum deposit.
As with any other form of payment, Apple Pay deposits are limited by relevant responsible gambling rules and regulations. These may be limits set by the casino or ones that you have set yourself.