on the confirm page, i had to update the code for the timestamp variable from:
<input id="x_fp_timestamp" name="x_fp_timestamp" type="hidden" value="<?php echo("<?php $WACalculatedHash = WA_CalculateHash(''.($WA_Authorize_Net_API_Credentials_Login_ID) .'', ''.($WA_Authorize_Net_API_Credentials_Transaction_Key) .'', ''.$sCart->GrandTotal() .'', ''.AuthNet_RandomID() .'', 'USD')?>
<?php echo $WACalculatedHash[1]; ?>"); ?>">
to:
<input id="x_fp_timestamp" name="x_fp_timestamp" type="hidden" value="<?php $WACalculatedHash = WA_CalculateHash(''.($WA_Authorize_Net_API_Credentials_Login_ID) .'', ''.($WA_Authorize_Net_API_Credentials_Transaction_Key) .'', ''.$sCart->GrandTotal() .'', ''.AuthNet_RandomID() .'', 'USD')?>
<?php echo $WACalculatedHash[1]; ?>"); ?>">
but now it is showing the following error:
<b>Fatal error</b>: Call to undefined function mhash() in <b>D:\PLESK\VHOSTS\redsneakers.net\office-furniture\WA_eCart\checkoutScripts\WA_simlib.php</b> on line <b>30</b><br />
the mhash funciton is one that is defined by php, you will need to contact the host to have them enable the mhash function