A lot of big video game releases nowadays include microtransactions and online stores where players can go to purchase exclusive items and cosmetics. Fortunately, the upcoming release DOOM Eternal won't be following this common trend.
Responding to a fan over on Facebook recently, id Software creative director Hugo Martin said there would be "no store" in Eternal because it's not a "free to play game or a mobile game" and the developer wanted to offer fans the "complete" experience.
Eternal is a $60 game, not a free to play game or a mobile game - we are giving [you] a complete experience with no store just like you'd expect.
While there's no store, you can still unlock skins for free by simply playing through the game. These are purely cosmetic unlocks tied to the XP system and don't have any impact on the gameplay.
DOOM 2016 did its best to avoid microtransactions but did end up temporarily selling some multiplayer DLC.