The physical debit card you need to order separately and it has a separate 16 digit number. So possibly revhappy only got the virtual debit card not the physical debit card so with virtual how to wave?It is kinda weird use case ? If you are overseas then why you are still doing online transaction that require OTP? Cos most likely it is just paywave kind stuff not the online transaction kind
Below are from fsm cso share in case it help anyone
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You can utilize the Debit Card for transactions wherever MasterCard is accepted, also please ensure your SGD Cash account maintains a sufficient balance. No separate activation process is needed.
For online purchases, an OTP (One-Time Password) is required to complete the transaction. However, for physical transactions, OTP is not necessary.
In the case of transactions in foreign currency, MasterCard will handle the conversion automatically, and no additional action is required on your part.