public function test_capture_surchargeAmount_optional()
{
$hash_in = array('litleTxnId' => '3', 'id' => 'id', 'amount' => '2', 'payPalNotes' => 'notes');
$hash_out = Transactions::createCaptureHash($hash_in);
$this->assertEquals($hash_in, array_intersect($hash_in, $hash_out));
}
