If I purchase multiple of the same item that match a multi-use offer, will I get credit for all items?

No. A multi-use item offer can only be used once per receipt or order. For example, suppose an offer for "Cashback on any soda" is eligible for five redemptions, and you purchase five sodas all on the same receipt. In that case, only one soda is eligible for the redemption.

Different offers can be redeemed from the same receipt, though!