At Target, you can link Ibotta with your Target Circle app or scan the receipt. If you link your accounts, you must use your Target app at the register or type in your phone number.
I prefer to scan my receipt. It takes a hour or so to go through, but I feel like I have more control.
I noticed my Target receipt now has a bar code at the top. I hadn't seen this before. I wonder if Ibotta can use this in the future. It would sure be easier than scanning a receipt.