I am having the same problem trying to pay with the app. However, I can pay if I access ebay with ebay.com through google. But then the item I purchased or I thought purchased is not showing up in purchased items. it disappears. to work around it I put in in my cart if I am in the eBay app, go back and access through Google with ebay.com and then make the purchase from my cart. Can't ask for combined shipping though.
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