If you want chips, you should buy them directly from inside the game (you can click on the "Get Chips" tab
at the top of the screen). It's the only legal way to buy chips.
 
Zynga is the only authorized seller of chips in its games.  Everyone else is engaging in fraud and/or breaking
various laws.  That's why they ask you to do strange things like providing your account information (hacking and phishing) or searching for tables with no other users so they can try to transfer chips. When you buy from Zynga, they immediately credit your account.  That's it.
 
Zynga has zeroed accounts belonging to users that buy chips from illegal chipsellers.  Also, they
say that chip resellers have been involved with some recent hacking incidents where people wound up
losing all their chips.