Purchasing
noun, verbal noun
If you create subscriptions to buy things, you're probably in the purchasing department. It's your responsibility to set up subscriptions and buy everything for everyone else because you're the purchasing person.
The reading is on'yomi, which is great for 購 but not as great for 買. Luckily, the reading for 買 is buy (ばい), which is the same as the meaning, which is a pretty awesome coincidence.
私は消費者の購買意欲について研究をしています。
I’m researching customers’ purchasing motivations.