XML request using post method

Question

I need to create payment module for opencart. The problem how to build xml output in php to post it to remote leasing server url: https://ecredit.leasing.com/eshop_test/UBLOnline.aspx?eshopdata=?

using post method. I trying to build this xml:

<?xml version="1.0" encoding="UTF-8"?>
<ContractRequest xmlns="http://e-credit.ubl.lt/eshop" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://e-credit.ubl.lt/eshop http://e-credit.leasing.com/eshop/contractrequest.xsd">
    <SaleLogin>test</SaleLogin>
    <SaleConditionID>111</SaleConditionID>
    <Person>
        <FirstName>John</FirstName>
        <LastName>Jones</LastName>
    </Person>
    <Communication>
        <StreetOrVillage>First</StreetOrVillage>
        <City>New York</City>
        <PostCode>21212</PostCode>
        <Phone>+100000000</Phone>
        <Email>john@mymail.com</Email>
    </Communication>
    <ContractDetails>
        <CreditAmount>617.60</CreditAmount>
        <CreditCurrency>USD</CreditCurrency>
    </ContractDetails>
    <OrderedItemsDetail>
        <Item>
            <Name>1 x HP 250 G5 UMA Celeron N3060 15.6 HD SVA, 1 x HP 15-r101na 15.6 HD Brightview flat (B), </Name>
            <Amount>2pcs.</Amount>
            <Price>617.60</Price>
            <Currency>USD</Currency>
        </Item>
    </OrderedItemsDetail>

</ContractRequest>

I have tried create xml like this:

$XmlString =  '<?xml version="1.0" encoding="UTF-8" ?>'; 
                  $XmlString .= '<ContractRequest 
    xmlns="http://e-credit.ubl.lt/eshop"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://e-credit.ubl.com/eshop http://e-credit.leasing.com/eshop/contractrequest.xsd">'; 


    $XmlString .= '<SaleLogin>' . $data['SaleLogin'] . '</SaleLogin>';
    $XmlString .= '<SaleConditionID>' . $data['SaleConditionID'] . '</SaleConditionID>'; 

    $XmlString .= '<Person>';  
        $XmlString .= '<FirstName>' . $data['first_name'] . '</FirstName>'; 
        $XmlString .= '<LastName>' . $data['last_name'] . '</LastName>'; 

    $XmlString .= '</Person>'; 

    $XmlString .= '<Communication>';
        $XmlString .= '<StreetOrVillage>' . $data['street'] . '</StreetOrVillage>'; 
        $XmlString .= '<City>' . $data['city'] . '</City>'; 
        $XmlString .= '<PostCode>' . $data['postcode'] . '</PostCode>'; 
        $XmlString .= '<Phone>' . $data['telephone'] . '</Phone>'; 
        $XmlString .= '<Email>' . $data['email'] . '</Email>'; 
    $XmlString .= '</Communication>'; 

    $XmlString .= '<ContractDetails>';

        $XmlString .= '<CreditAmount>' . $data['amount'] . '</CreditAmount>'; 
        $XmlString .= '<CreditCurrency>' . $data['currency'] . '</CreditCurrency>'; 
    $XmlString .= '</ContractDetails>'; 

    $XmlString .= '<OrderedItemsDetail>';
        $XmlString .= '<Item>';
            $XmlString .= '<Name>' . $data['description'] . '</Name>'; 
            $XmlString .= '<Amount>' . $data['products_amount'] . '</Amount>'; 
            $XmlString .= '<Price>' . $data['amount'] . '</Price>'; 
            $XmlString .= '<Currency>' .$data['currency'] . '</Currency>'; 
        $XmlString .= '</Item>'; 
    $XmlString .= '</OrderedItemsDetail>'; 


$XmlString .= '</ContractRequest>'; 

and after :

$url = https://ecredit.leasing.com/eshop_test/UBLOnline.aspx?eshopdata=?;
$header = array();

                        $header[] = 'Content-Type: text/xml';
                        $header[] = 'Content-Length: ' . strlen($XmlString);

                        $ch = curl_init();

                        curl_setopt($ch, CURLOPT_URL, &url);
                        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
                        //curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 1);
                        curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'POST');
                        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
                        curl_setopt($ch, CURLOPT_HTTPHEADER, $header);
                        curl_setopt($ch, CURLOPT_POSTFIELDS, $XmlString);
                        ///////////////////////
                        $response = curl_exec($ch);

                curl_close($ch);

    $XmlString = simplexml_load_string($response);

            //create object to use as json
            $json = array();



                $json['redirect'] = $this->url->link('checkout/success', '', true);


            $this->response->addHeader('Content-Type: application/json');
            $this->response->setOutput(json_encode($json));

but this does not work... sad.... what i miss?

how to create properly xml request and post it to url?

Answer 1

You already has some tips (and maybe your answer) in the comments, but here is some thoughts on what you should do to improve your code and also help others to help you.

PHP gives you some good resources to create XML, you should use them. I recommend DOMDocument. Below is a starter code to your example.

$dom = new DOMDocument('1.0', 'utf-8');
$dom->preserveWhiteSpace = false;
$dom->formatOutput = true;

$namespace = 'http://e-credit.ubl.lt/eshop';
$contractRequest = $dom->createElement('ContractRequest');
$contractRequest->setAttributeNS('http://www.w3.org/2000/xmlns/', 'xmlns', $namespace);
$saleLogin = $dom->createElement('SaleLogin', 'test');
$saleConditionID = $dom->createElement('SaleConditionID', '111');

$contractRequest->appendChild($saleLogin);
$contractRequest->appendChild($saleConditionID);
$dom->appendChild($contractRequest);
//you got the idea...

For the curl part, first change the first setopt to curl_setopt($ch, CURLOPT_URL, $url);. Now, before close your curl handle, insert the following code:

if($response === false)
{
    echo 'Curl error: ' . curl_error($ch);
}

If it not work, you can debug your curl request. This another question may help you.

UPDATE

I think that the use of curl for your request is the right option, but, as you requested in the comment, here is an option if your curl request continues to fail.

$payload = array();
$payload['header'] = 'Content-Type: text/xml';
$payload['header'] .= 'Content-Length: ' . strlen($XmlString);
$payload['content'] = is_array($XmlString) ? http_build_query($XmlString) : $XmlString;
$payload['method'] = 'POST';
$payloadContext =  stream_context_create(array('http' => $payload));
$result = file_get_contents($url, false, $payloadContext);
if ($result === false) {
  print_r ("Error in your request. Check logs for more information");
}

As I said, its just an option, but curl remains a good one, you just need to correct it.