Error: The totals of the cart item amounts do not match order amounts.

[KEnik]

For me works

// $st = $optionsST['ITEMAMT'] + $optionsST['TAXAMT'] + $optionsST['SHIPPINGAMT'] + $optionsST['HANDLINGAMT'];

$st = $optionsST['ITEMAMT'] + $optionsST['SHIPPINGAMT'] + $optionsST['HANDLINGAMT']; // Do nto count TAX is included in $optionsST['AMT']

if ($st != $optionsST['AMT']) $optionsST['HANDLINGAMT'] += ($optionsST['AMT'] - $st);