Is that a legitimate question.
If yes,
Your best option is to contact the seller and let them know about it. Then, if they agree, they will initiate a transaction cancellation request in the resolution centre and you will get an email. Just accept that request after reading it.
Another scenario:
If you fail to do so, the seller could open an UPI (Unpaid Item) against you after 4 days. Then you have 4 days to pay for your purchase after which you will earn an unpaid item strike against your account. Too many of those and you are out. Also once you receieve more than 1 strike, you won't be able to buy from many listings as the sellers filter out potential buyers who have unpaid item strikes.
Hope this helps.
tl;dr: Contact the seller immediately.