This question already has an answer here:
For credit cards that give different amounts of cash back based on the category:
How can I go about figuring out how my purchase from some particular merchant will be categorized before I make a purchase from that merchant? Is there an easy way (ideally online)?
Note: I thought this was obvious, but I am not asking how credit card companies (or merchants) determine the purchase categories. That's I'm asking if there is any way for me to figure them out before making a purchase. So -- no, the duplicate isn't a duplicate...