When I first started vaping, I went nuts ordering all kinds of samples and mods and stuff. I learned a hard lesson about ordering online. You seriously have to pay attention, and make sure you have a system to make sure you get your stuff. I lost an order because I sent it to my billing address. No tracking number, nada. Mailman left a note "will return to sender if not picked up from Post Office within 10 days". I had been out of town for over 2 weeks, so I missed it. I still have no idea what it was, where it came from, or how much it cost ($20? $200?).
Now, I save a copy of the confirmation page in a folder on my desktop. All my e-receipts get a star and are labeled "receipts" (gmail). As they come in, I remove the star and delete the confirmation.