Can you use a debit gift card to buy mmf2?

Probably, though someone from Clickteam would have to answer this to be sure.

There are a few ways:

1. You can just wait for an admin to come online and answer.
2. You can PM an admin (Please login to see this link.).
3. You can download ClickConverse and ask Jeff, since he's almost always online (this is perhaps the quickest way, but it might not get you an answer, since there is the off chance that Jeff isn't online).
4. You can contact Clickteam Please login to see this link..

There might be more ways, but these are perhaps the four most important ways.

Using this should be perfectly fine. It bears the Visa symbol so it should work...

Oh, using multiple ones won't work unless you can exchange a few for a sum equal or bigger than the total value of sale...

Quote from UnicornMan

oh ok I dont know if they sell $400 gift cards.
but thanks I will look for one!

You might not need MMF2DEV yet (only if you're really serious about game development), so you might only need an around 100$ gift card.

You can get blank ones that allow you to put any amount of money in them. Mastercard offers them at least. Just use your cards to preload a big one and you're set.