Hi Everyone, I have been recently contacted by a private advertiser for one of my sites. He has asked me to send an invoice for the required amount. I have some questions: 1) Can I send money request over Paypal. Is that considered a valid invoice? 2) He has asked me to put banner ads. Other than the creative and URL of his site, do I require anything else also from him? Is anything required for tracking purpose? 3) Am I missing something above? Any other suggestions most welcome.