BEWARE. Dont give info. until payment is received

I was contacted by this user, Who sent me an offer on my account. I accepted the offer. He then responded "In order to procede"
You can eithor Give me your account information based off my feedback and i will issue 100% of payment OR
If you can provide screenshots to verify the account i will issue 100% of payment OR
I will issue 50% of payment you send your account details i will verify the account and issue the other 50% of the payment. Dont forget to leave your paypal information so i can Issue the payment.

So i responded with my account details. And paypal information. There was no other agreements or arrangements made.
I waited a day then contacted this user requesting information where he stood on this transaction. No response..
I waited another day and sent another message requesting the same thing.. Still no response. I changed my account information after being contacted 4 days later. And was told he no longer was interested.