https://www.gamespot.com/articles/star-wars-battlefront-2-how-does-progression-work/1100-6454866/

There are three major currencies to manage in multiplayer, which you use to open loot crates, purchase microtransaction packs, and upgrade your Star Cards. Below you can find details on each of the three currencies, what they do, and how you earn them.

As you play the game, you'll steadily earn Loot Crates, which contain a combination of items and valuables, including Star Cards, weapons, Credits, Crafting Parts, and victory poses/emotes. There are three crate types in total, and each supplies you with items and valuables for the specific category they're associated with. Below you can find details on each crate type's price point across the two main currencies.