币

bì money; coins; currency; silk

信

xìn letter; mail; CL:封[feng1]; to trust; to believe; to profess faith in; truthful; confidence; trust; at will; at random

怎么

zěn me how?; what?; why?

zěn me variant of 怎麼|怎么[zen3 me5]

购买

gòu mǎi to purchase; to buy

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