I was using coinbase, not coinbase pro. I purchased both with credit cards (don't remember which ones) and also local currency. I realize that I can go back through all my credit card statements for the last several years, and bank statements, but I was hoping there would be an easier way.
The tiring thing about that is going to be checking the statements and correlating the price on that current purchase. That's going to be troublesome especially if you are busy
How about contacting the support? Maybe they can help you faster with it.
https://help.coinbase.com/en/more/coinbase-commerce