Mr. Number app

Hello, I have an android phone and I'm looking to install the Mr. Number app. Once I did, it requires some form of payment to proceed. I noticed it allows such credit cards like visa, Mastercard, etc. Does it allow pre-paid gift cards in the form of a visa, Mastercard, etc. Or Does it have to be an actual bank card and not pre-paid credit gift card? Hopefully I posted this in the right forum. TIA