Please make sure that the email you enter here is the one you use in Paypal
<form name="checkout_confirmation" action="http://www.sandbox.paypal.com/cgi-bin/webscr" method="post" >
      <input type="hidden" name="cmd" value="_xclick">
    <input type="hidden" name="amount" value="10">
    <input type="hidden" name="business" value="sales@your_domain.com">
  <input type="hidden" name="item_name" value="Purhchase of Chat Instance">
  <input type="hidden" name="item_number" value="38.107.179.211.1328638722">
   
  <input type="hidden" name="on0" value="">
  <input type="hidden" name="on1" value="">
  <input type="hidden" name="no_shipping" value="1">
  <input type="hidden" name="shipping" value="0">
  <input type="hidden" name="currency_code" value="USD">
  <input type="hidden" name="return" value="http://www.tolimafm.com/chat/buy_instance.php?from=return&type=Purhchase of Chat Instance&user_name=&session_inst=1">
  <input type="hidden" name="cancel_return" value="http://www.tolimafm.com/chat/buy_instance.php?from=cancel&type=Purhchase of Chat Instance&user_name=&session_inst=1">
  <input type="hidden" name="notify_url" value="http://www.tolimafm.com/chat/buy_instance.php?from=notify&type=Purhchase of Chat Instance&user_name=&password=&email=&session_inst=1&buy_instance=1">
  <INPUT type="hidden" name="rm" value="2">
  <input type="hidden" name="no_note" value="1">
  <input type="image" src="http://images.paypal.com/images/x-click-but03.gif" border="0" name="submit" alt="Make payments with PayPal - its fast, free and secure!">
</form>