Alberta blue cross and claiming a breast pump

So I’m able to claim a breast pump on my health spending account which is awesome but I was told when I buy one I would need a full medical receipt not just a printed one. I’m confused as to what this means. I was hoping to buy one at babies r us but I’m not sure I’d get a full medical receipt for it. I went to my pharmacy to see if they sell them there as the man from

Blue cross said they accepts receipts from

One purchased at a pharmacy but I was told that you cannot purchase one from them and they only rent them out. Has anyone claimed a pump bought at a store like babies r us? I’m just so confused with this and I need to use my health spending account before my benefits stop when I start maternity leave next month.