You can not transfer money from a VISA card to your Octopus... You basically have to load money on O'ePay account, which either involves going to a shop or you can link your bank account but others have commented it takes 3 days for bank transfer and there is also some transaction fees...
Cannot register smart octopus with Samsung pay with Note 8?
Recently cannot transfer funds between Octopus SIM and O!ePay ac in mobile, alway said octopus card not registered and advise to enable online services (no this error before)
垃圾app。廢柴CEO 仲話冇興趣同apple pay 呢啲合作，去食屎啦。
Can't transfer money from Oepay to Octopus mobile sim very often
Cannot read most 9f the time
Various enhancements and fixes
Easily recharge your Ntc & Cell mobile by scanning a recharge card.