https://www.gamespot.com/articles/fallout-76-has-microtransactions-but-perk-cards-ca/1100-6461107/

Fallout 76 brings back the franchise's Perk system, but this time the Perks will be acquired and represented through "Perk Cards." Immediately after this was announced at QuakeCon, fans began to wonder if they would be able to purchase these card packs with real money.

Bethesda has now confirmed that Perks Card Packs can only be acquired through gameplay. A tweet from the Fallout account explains that Perk Card Packs are earned "solely" by levelling up, which may put some fans' minds at ease about the matter. Bethesda's Pete Hines also commented, saying to a fan, "You just get them when you level up."