A bid or commitment to buy on eBay is considered a contract and you're obligated to purchase the item. However, if you feel that you have a legitimate reason for not buying the item, you can contact the seller and explain your situation.
Many sellers are willing to work with you if you communicate with them openly and honestly. If you haven't done so already,
request the seller's contact information, explain the situation, and see if they are willing to
cancel the transaction in the Resolution Center. If the seller opens a case, you'll receive an email asking you to agree to the seller's request to cancel the purchase. Be sure to promptly accept the seller's request.
If the seller doesn't agree to the cancel the transaction and you don't pay for the item, an unpaid
item will be recorded on your account. If you get too many unpaid items recorded on your account within a short time period, your account may be limited or suspended.