Most important information to include when selling an account
Use this as an information template, it will help you to provide everything that may be needed in the future.

LOGIN INFORMATION:
login name:
password:
security question and answer:

DAY ONE REGISTRATION INFORMATION:
(From day one, when you made account.)
name:
phone:
address:
birth date:
email address:
First CD KEY:

CURRENT INFORMATION NOW:
name:
phone:
address:
email address:

Test your SQA for 4CcuraCy - you may THINK you know it and be wrong. The easiest way to check is to log into account management, click on something like 'parental controls' which will ask you for it. See if you can make it work. If you don't know what it is, then call the company and ask them what it is. They will authenticate you, and then help you get it or reset it.

If you can provide the last 4 of the first credit card used for the account, that will help the new owner with any authentication requests. On an authentication challenge, Sony sometimes requires a user to provide the details on every single card that was ever used on an account. If an account is seven years old, that is seven years of cards. It is also helpful to include a picture of your driver's license with the security code blacked out.

After transferring ownership of an account to a new person, it is best to have a gap of 1-2 days between when you log off an the new owner logs on. Gaps of over a week are suspicious. It is also good to leave registration information alone. Do not change it before, during, or after the sale. After waiting a week or two, then change it. Continue to play your account a little bit while it is listed for sale. It is not uncommon for Blizzard to notice a difference between the computers that are accessing the account. When this happens, they send an email and change the password. The new owner doesn't always get the email, even if the email address was changed. Sometimes, the old owner gets the email. Blizzard Entertainment now requires a notarized document in the event of an authentication challenge. It is good to have this document prepared in advance for the new owner incase they ever have any issues. Just fill it out, get it notarized. And if they ever need it, they can just change the date by scanning it and using photoshop, (or even whiteout) and then sending it to blizzard by fax. Fax machines offer very low quality, so they aren't going to notice the alteration. These steps can save you losses worth several hundred dollars. Get document that needs to be notarized

The safest way to purchase an account is account to account transfer.
Here's information on how to do it.

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