If you are looking to cancel an order go to the email with the purchase ID attached to it or within the email from Apple. You should be able to "Report" the purchase and therefore refund or cancel the purchase.
The issue in GetHuman1022189's own words
The problem: Placed an order accidentally. Don’t want the items
GetHuman1022189 did not yet indicate what American Eagle Outfitters should do to make this right.
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