Feedback is an open forum where members can leave comments about their experiences with their transaction partners. It's important to remember that, in most cases, the Feedback you leave is permanent. Also, there are a few things we won't allow.
If you've successfully completed a transaction with another eBay member and they haven't left you Feedback, it's fine to send them a quick email as a friendly reminder. But remember that Feedback is completely voluntary.
In most cases, you can't change Feedback once you've left it. However, if you've left negative or neutral Feedback for a seller and you want to change it to a positive, the seller may be able to request Feedback revision from you.
Buyers aren't allowed to use threats of poor Feedback or low detailed seller ratings to get something that wasn't part of the original listing. Sellers aren't allowed to demand positive Feedback from buyers.
Members aren't allowed to exchange Feedback for the sole purpose of increasing Feedback scores, gaining eBay privileges, or enhancing reputation. Buyers aren't allowed to attempt to damage a seller's Feedback through a series of repeat purchases.