This is my code. I would like to get additional_information on API. I'm using getPayment, on this way, I believe that I can define this function there. I don´t know, just looking for some help or something that I can use. I´ll appreciate any help.

 * Retrieve order payment model object
 * @return Mage_Sales_Model_Order_Payment
public function getPayment()
    foreach ($this->getPaymentsCollection() as $payment) {
        if (!$payment->isDeleted()) {
            return $payment;
    return false;

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