how to integrate paypal with return data?

[tokyblete]

I have created a new business account in paypal and created a button but I have these two problems;1. when I passed the price for service, and user click (pay now) button then user go to paypal page but the price that I put is not showing as a primary price in paypal page. the item price is empty in paypal. user has to put the price in paypal too.and the price that has passed is in (Options: service price: 12) which is not counted in the total amount.this is the code of the button that I insert it in my page:\[code\]<form action="https://www.paypal.com/cgi-bin/webscr" method="post" target="_top"><input type="hidden" name="cmd" value="http://stackoverflow.com/questions/15845568/_s-xclick"><input type="hidden" name="hosted_button_id" value="http://stackoverflow.com/questions/15845568/3YNEZFSSJNVR4"><table><tr><td><input type="hidden" name="on0" value="http://stackoverflow.com/questions/15845568/service price">service price</td></tr><tr><td><input type="text" name="os0" maxlength="200"></td></tr></table><input type="image" src="https://www.paypalobjects.com/en_US/i/btn/btn_paynowCC_LG.gif" border="0" name="submit" alt="PayPal - The safer, easier way to pay online!"><img alt="" border="0" src="https://www.paypalobjects.com/en_US/i/scr/pixel.gif" width="1" height="1">\[/code\][*]the second problem how I can pass the transaction info to my website to record it in my database? is that need special account different than standard (free) account