public function addCredit($hash_in)
{
$hash_out = Transactions::createCreditHash($hash_in);
$choice_hash = array($hash_out['card'], $hash_out['paypal'], $hash_out['token'], $hash_out['paypage']);
$this->addTransaction($hash_out, $hash_in, 'credit', $choice_hash);
$this->counts_and_amounts['credit']['count'] += 1;
$this->counts_and_amounts['credit']['amount'] += $hash_out['amount'];
}