Assist with USPS API using PHP Curl - php

Question

Hello I am trying to do API call to USPS API using PHP Curl.
I get the following response:
[Number] => 80040B19
[Description] => XML Syntax Error: Please check the XML request to see if it can be parsed.
[Source] => USPSCOM::DoAuth
I put together my code for the API call from some sample code on here and also the sample on the USPS site; but cannot get it to work (getting error above); here is my code:
$input_xml = '<AddressValidateRequest USERID="xxxxxxx">
<Address ID="0">
<Address1></Address1>
<Address2>6406 Ivy Lane</Address2><City>Greenbelt</City>
<State>MD</State>
<Zip5></Zip5>
<Zip4></Zip4>
</Address>
</AddressValidateRequest>';
$url = "http://production.shippingapis.com/ShippingAPITest.dll?API=Verify";
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_POSTFIELDS,
"xmlRequest=" . $input_xml);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 300);
$data = curl_exec($ch);
curl_close($ch);
//convert the XML result into array
$array_data = json_decode(json_encode(simplexml_load_string($data)), true);
print_r('<pre>');
print_r($array_data);
print_r('</pre>');
I am hoping someone can help with what I am doing wrong...

Answer 1

According to the documentation, you're supposed to pass the XML in a field named XML, not xmlRequest. Try something like this instead:
<?php
$input_xml = <<<EOXML
<AddressValidateRequest USERID="xxxxxxx">
<Address ID="0">
<Address1></Address1>
<Address2>6406 Ivy Lane</Address2>
<City>Greenbelt</City>
<State>MD</State>
<Zip5></Zip5>
<Zip4></Zip4>
</Address>
</AddressValidateRequest>
EOXML;
$fields = array(
'API' => 'Verify',
'XML' => $input_xml
);
$url = 'http://production.shippingapis.com/ShippingAPITest.dll?' . http_build_query($fields);
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 300);
$data = curl_exec($ch);
curl_close($ch);
// Convert the XML result into array
$array_data = json_decode(json_encode(simplexml_load_string($data)), true);
print_r('<pre>');
print_r($array_data);
print_r('</pre>');
?>