ZP and BP questions

Hi, I have a few questions about ZP, BP, and other things

1. How do you get BP?
2.Does it have to be used within a set amount of time?
3.How do Coupons work and what do they do?
4.If I buy a 20$ UGC in Canada, how much ZP will that be in Crossfire? (since in other games I've played, its less for Canadians)

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