how does the downloading and everything work once i purchase

so basically i wanna buy bo4 digital that cost £71.99 and im in uk so i wont be charged more right i didnt make the purchase i will once i get a proper reply eventhugh could u just briefly explain once i purchase what am i meant to do or how do i get the full game bo4 digital delux from ull is it a code that i use somewhere or do i directly get the game once i purchase is it the full game im getting or is it less stuff less maps what i dunno. could u please tell me, thank u