For PlayStation users who have email binded their accounts it is now possible to use the GE you bought on the PlayStation Store on PC and it is also possible to buy
War Thunder (PC): Test, News, Video, Spieletipps, Bilder
Platform Wars: War Thunder Connecting PC And PS4 | Rock Paper Shotgun
How can I connect my ps4 account to my pc game : r/Warthunder
How to link your PlayStation account to your E-mail – Gaijin Support
War Thunder cross-platform play coming soon on PS4, PC | Engadget
PS4版WarThunderのアカウントにPC版でサインインする方法 | 司令官のブログ(仮)
How to link your PlayStation account to your E-mail – Gaijin Support
War Thunder (PS4, PC) - Alle Infos zum MMO-Kriegsspiel
Transfer PlayStation account to PC – Gaijin Support