Purchase
noun, する verb
When your subscription enters into effect, you have made your purchase. This one's a bit weird because it seems like it should refer to a subscription, but I guess it is a one time subscription, and your subscription lasts your whole life?
こうにゅう
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
この店で偽のシャネルN°5を購入しました。
This is the store where I bought the fake Chanel Number 5.