Microtransactions in BattleBit Remastered are summarized as...
The game contains no microtransactions. The game has an initial price, as well as a supporters pack. The supporters pack is more expensive than the game itself. This pack contains weapon skin for just about all weapons in the game, as well as skins for as of yet unreleased weapons, but it's primary purpose is to support the development of the game. The pack can be purchased separately or bundled with the game for a small discount. More of these packs are expected in the future.
The game is still in early access, but the developers have stated there are no plans for any sort of microtransactions.