Mission Funds is an in-game currency in Mass Effect Andromeda.
In Multiplayer, in-game currency will be used to purchase blind packs which will unlock new Weapons, kits and Items at random. You can bypass this with real money if you like. To alleviate some of the grind, there will also be a store that sells an assortment of loot on a rotating basis. You can use either real money or an in-game currency called Mission Funds at this loot store. Mission funds will have in game implications.