For the record, for anyone that is reading and is unfamiliar with this scam, please read:
Anytime a buyer wants you to text or email them, it is a SCAM.
Do not engage with them at all. Give them no information.
Report the "buyer"
Block https://offer.ebay.com/ws/eBayISAPI.dll?bidderblocklogin
Ignore
The whole idea is for the seller to be blinded with greed, or just stupidity, and for the scammer to get the seller's phone number or email address. Once that happens, the seller receives a very real looking, but very fake email stating that they have been paid, and in order to receive their funds they need to ship the item right away. Sometimes these emails will also have a phone number, for the seller to call and "verify" the transaction. That phone number is a direct line to the scammer.
These scammers depend on a seller's greed/naivete/ignorance/stupidity to ship the item without checking to see if they have actually been paid. It works surprisingly well, even with established sellers, because for some strange reason people want to "trust" emails.
There is no reason on this planet for a buyer to need a seller's email address, phone number, or any sort of financial/payment information. Everything a buyer needs is right there when they click the buy now button on a listing.
In addition to the above, anyone asking for a gift card to be included is a SCAMMER. Anyone offering to pay more for an item than the listing price is a SCAMMER. Anyone making an offer higher than the buy it now price is a SCAMMER.
Don't fall for it. You will NOT GET PAID. You WILL BE ROBBED of your item.
The easier you are to offend the easier you are to control.
We seem to be getting closer and closer to a situation where nobody is responsible for what they did but we are all responsible for what somebody else did. - Thomas Sowell
