amount too long or not numeric

Ok I fixed this by changing line 368:

$amount = $arg1->order_total * 100; //amount *100

into

$amount = round($arg1->order_total,2) * 100; //amount *100

My guess is that the VAT module added some extra decimal places to the final amount and ogone doesn't digest these small numbers very well.
Rounding the number again to a number with 2 decimal places fixed the problem.

While I was there I found another occurrence of the
$amount = ... on line 332...

$orderid = $arg1->order_id;
$amount = $arg1->order_total * 100; //amount *100

$orderid and $amount are not used untill both lines are called again on 368. Guess they can be removed too.

What do you think Kees?