Is this for a click and collect item? Then eBay should send you an email with that important collection code. Check your Purchase History and the Order Details for the item it might be there.
If not you need to contact eBay Customer Services they will provide that important code, and you have 7 days to collect when informed the item is in store.
This is the easiest and quickest way to contact eBay Customer Services from the link below, for a Call Back option. I do recommend contacting CS very first thing in the morning when the lines first open, as there's more chance of Dublin answering.
https://www.ebay.co.uk/help/eua?id=5275&mkevt=1&mkpid
Lines open between 8 a.m. to 10 p.m. on weekdays.
9 a.m. to 6 p.m. on weekends.
Collection code to collect from an eBay's seller's address? That too, should be in your eBay messages, email, or order details.
@careylongfield
