/**
* credit a customer for the passed transaction
*
* @access public
* @param int $customerId
* @param array $transactionAttribs
* @return Result\Successful|Result\Error
*/
public function credit($customerId, $transactionAttribs)
{
$this->_validateId($customerId);
return Transaction::credit(array_merge($transactionAttribs, ['customerId' => $customerId]));
}