Partial refund error

Floyder — Sun, 30 May 2021 07:26:10 GMT

Hello,
I am trying to sent partial refund but get error code 5 "A valid amount is required."

$creditCard = new AnetAPI\CreditCardType();
$creditCard->setCardNumber($lastFourDigits);
$creditCard->setExpirationDate("XXXX");
$paymentOne = new AnetAPI\PaymentType();
$paymentOne->setCreditCard($creditCard);

$transactionRequest = new AnetAPI\TransactionRequestType();
$transactionRequest->setTransactionType('refundTransaction');
$transactionRequest->setAmount(2.4);
$transactionRequest->setPayment($paymentOne);
$transactionRequest->setRefTransId($transaction_id);

Original transaction amount $8.39.

There are no filters for the size of the payment.

With a full refund, this code works.

What should I do for refund an amount that is less than that of orginal transaction amount?

Thank you in advance

topic Partial refund error in Integration and Testing

Partial refund error