buyer says they're unable to make payment and been advised by eBay to contact me.

I've checked my account and everything seems in order.  I've sold before without any payment issues but I'm not sure how to sort this out.

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It's a standard error message - the buyer hasn't personally been told to contact you.

 

If all is well at your end (no-one else has had payment problems), then just tell the buyer to try again later - it's probably a temporary Ebay glitch (Sunday is Ebay's busiest day at normal times, let alone this close to Christmas).  If the buyer continues to have problems, though, it will likely be a problem at their end. They will have to contact their payment provider for assistance.

 

@reprobate_99