Pop up, incentive/discount if ebay app downloaded and paid through app

I recently had a popup on my laptop at ebay.co.uk, claiming £10 off if purchased through the ebay app.....and a QR code that took me to the app store.  I downloaded app, made the purchase, but no sign of coupon/voucher or discount! Struggling also to find how to contact ebay about it! ....not amused.

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