From GameWatcher: “Wolfenstein: Youngblood, the first co-op title in the series, is finally out. Like other high profile releases, the title does, after all, feature microtransactions which in this case go by the name of Gold Bars.
Gold Bars are one of three currencies in Wolfenstein: Youngblood, and being tied to microtransactions are the only ones you cannot earn in-game. Instead, you’re going to have to buy them with real money.”
Source: N4G PC Wolfenstein: Youngblood Microtransactions – Gold Bars