At the bottom of the Developer Products article it states 'Roblox itself does NOT record the purchase history of developer products by specific players, although you can view overall daily/monthly stats as outlined here. If you want to track player-specific purchase history, it’s your responsibility to store the data, typically with data stores.'
However on the contrary, Roblox does in fact record the purchase history of developer products, and this practice is practically unnecessary.
Issue Area: DevHub Content
Page URL: Developer Products – In‑Game Purchases