I have insert the code
<?php echo $WA_PP_ECO_DoResult->fullRequest; ?>
<br/><br/>
<?php echo $WA_PP_ECO_DoResult->fullResponse; ?> in pp_checkout_failure.php page and the error is:
Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at C:\xampp\htdocs\mysite.it\pp_checkout_failure.php:3) in C:\xampp\htdocs\mysite\WA_eCart\WA_eCart_Definition_PHP.php on line 479
I attach files