eBay

Buyer accepted an offer but has asked me to cancel saying I can sell for more. Buyer accepted even after I made aware of a mark on trading card. Should I cancel or shall I accept their cancelation? Thx. CP

Buyer wants bid retracted because of a manufacturer mark I didn't see before posting. Can I as the seller or he as the buyer retract the bid? Thx. CP

Bidder noticed a small defect on a card I didn't notice. Can I retract his bid?

Wanna make an offer to someone who's already bid but ni "offer" options on my listing. Is that common? Thx. CP