I just had this confusion with a Paypal transaction too, also labeled "promotional return". After doing some digging, I found it was a "one-time payment" I made to Ebay to pay down my fee balance. My Ebay fees are usually auto-payed 1x per month through my account, but sometimes when my balance is getting high for the month, I'll make an additional mid-month payment. This transaction turned out to be just that. No idea why it's labeled "promotional return" as that makes no sense. Hope this helps someone!
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