As it is now a requirement to add a payment method before making an offer, unless the seller has opted out, can you clear up a few issues including how to ask for an invoice for combined postage if buying more than one item from the same seller, also how to select Click & Collect if offered? Also does it apply to collection items as cash has been the recommended payment in the past.

Also, if an offer is received through the watch list is a payment method required before the offer can be accepted or countered?

Finally, Is it the case that sellers in UK have automatically been opted in to this requirement.

There appears to have been quite a bit of confusion since it was introduced.