FIELD CODE LIST FOR 2.2.1. See the bottom of this thread for AWPCP 3.0+
Valid codes for the show ad page layout
$ad_title
$featureimg
$codecontact
$adcontact_name
$location
$aditemprice
$adcontactphone
$adcontactemail
$awpcpextrafields
$awpcpvisitwebsite (only valid in 1.0.6.8 or higher)
$showadsense1
$addetails
$showadsense2
$awpcpshowadotherimages
$awpcpadviews
$showadsense3
$ad_startdate
$ad_postdate
$ad_categoryurl
$ad_categoryname
$city (in 1.8.9.2 and higher)
$state (in 1.8.9.2 and higher)
$country (in 1.8.9.2 and higher)
$village (in 1.8.9.2 and higher)
Valid codes for the display ad listings page layout
$addetailssummary
$ad_title
$awpcpadpostdate
$awpcp_state_display
$awpcp_display_adviews
$awpcp_city_display
$awpcp_display_price
$ad_categoryname (in 1.8.7.2 and higher)
$city (in 1.8.9 and higher)
$state (in 1.8.9 and higher)