Sample PHP Code
Query

function testXmlQuery($username,$password,$constraints)
{
    // transactionFields has all of the fields we want to validate
    // in the transaction tag in the XML output
    $transactionFields = array(
        'transaction_id',
        'transaction_type',
        'condition',
        'order_id',
        'authorization_code',
        'ponumber',
        'orderdescription',
        'avs_response',
        'csc_response',


        'first_name',
        'last_name',
        'address_1',
        'address_2',
        'company',
        'city',
        'state',
        'postal_code',
        'country',
        'email',
        'phone',
        'fax',
        'cell_phone',
        'customertaxid',
        'customerid',
        'website',

        'shipping_last_name',
        'shipping_address_1',
        'shipping_address_2',
        'shipping_company',
        'shipping_city',
        'shipping_state',
        'shipping_postal_code',
        'shipping_country',
        'shipping_email',
        'shipping_carrier',
        'tracking_number',

        'cc_number',
        'cc_hash',
        'cc_exp',
        'cc_bin',
        'avs_response',
        'csc_response',
        'cardholder_auth',

        'processor_id',

        'tax');
    // actionFields is used to validate the XML tags in the
    // action element
     $actionFields = array(
         'amount',
         'action_type',
         'date',
         'success',
         'ip_address',
         'source',
         'response_text'
          );

    $mycurl=new curl();
    $postStr='username='.$username.'&password='.$password. $constraints;
    $url="https://secure.cyogate.net/api/query.php?". $postStr;
    $mycurl->execute($url);

    $testXmlSimple= new SimpleXMLElement($mycurl->data);

    if (!isset($testXmlSimple->transaction)) {
            throw new NmExUser('No transactions returned');
    }

    $transNum = 1;
    foreach($testXmlSimple->transaction as $transaction) {
        foreach ($transactionFields as $xmlField) {
            if (!isset($transaction->{$xmlField}[0])){
                throw new NmExUser('Error in transaction_id:'. $transaction->transaction_id[0] .' id  Transaction tag is missing  field ' . $xmlField);
            }
        }
        if (!isset ($transaction->action)) {
            throw new nmExUser('Error, Action tag is missing from transaction_id '. $transaction->transaction_id[0]);
        }

        $actionNum = 1;
        foreach ($transaction->action as $action){
            foreach ($actionFields as $xmlField){
                if (!isset($action->{$xmlField}[0])){
                    throw new NmExUser('Error with transaction_id'.$transaction->transaction_id[0].'
                                        Action number '. $actionNum . ' Action tag is missing field ' . $xmlField);
                }
            }
            $actionNum++;
        }
        $transNum++;
    }

    return;
}

try {

    $constraints = "&action_type=sale&start_date=20060913";
    $result = testXmlQuery('test123','test1234',$constraints);
    print "Success.\n";

} catch (Exception $e) {

    $e->outputText();

}



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