I need 12 months of transactions for tax preparation. How do I download all tranactions for 2020?

Hello 1stargroup,

You don't say which history exactly.

For Apple Card, see this document:

Download or export your Apple Card statements and transactions - Apple Support

For iTunes and App Store there isn't an equivalent service. It might be a good idea to keep all email receipts for this purpose. Alternatively you can see if you can get what you need with a data request. You can also see a history on your device or with a computer. Note the bit about scrolling down to get older records. If you had to I guess you could just do screenshots of all the pages. See your purchase history for the App Store, iTunes Store, and more - Apple Support