Card Tokenization & Testing

I’d like to know if there is a way to verify a tokenized card has enough balance before charge.

Sorry, but this Isn’t possible at the moment.

I have been trying to make use of the Test MasterCard for Rave Checkout but I keep getting the error “Currency not yet supported”

The error you stated usually occurs when you do not sign up on the sandbox environment. Kindly follow this link to sign up: https://flutterwavedevelopers.readme.io/docs