Код ошибки soap client

Читаем wsdl. Находим нужный запрос.

<operation name="Tracking">
  <input message="tns:TrackingRequestMessage"/>
  <output message="tns:TrackingResponseMessage"/>
</operation>

Значит запрос Tracking принимает на вход TrackingRequestMessage. Смотрим дальше

<message name="TrackingRequestMessage">
  <part name="parameters" element="tns:Tracking"/>
</message>

Единственное поле parameters с типом Tracking. Ищем этот тип.

<xs:element name="Tracking">
  <xs:complexType>
    <xs:sequence>
      <xs:element name="Language" type="xs:string" nillable="true"/>
      <xs:element name="Login" type="xs:string" nillable="true"/>
      <xs:element name="Password" type="xs:string" nillable="true"/>
      <xs:element name="Type" type="xs:string"/>
      <xs:element name="Documents" type="xs:string" nillable="true"/>
    </xs:sequence>
  </xs:complexType>
</xs:element>

Получаем объект или ассоциативный массив с текстовыми полями Language, Login, Password, Type и Documents, причём все поля кроме Type могут иметь значение null.
Значит запрос должен выглядеть как

$result = $client->Tracking([
    'Language' => ?string,
    'Login' => ?string,
    'Password' => ?string,
    'Type' => string,
    'Documents' => ?string
]);

То же самое можно получить и средствами PHP. После подключения к клиенту получим список методов.

var_dump($client->__getFunctions());
/* ...
[92] => string(47) "TrackingResponse Tracking(Tracking $parameters)"
... */

Значит метод Tracking принимает один параметр с типом Tracking и возвращает ответ типа TrackingResponse.
Запросим типы.
var_dump($client->__getTypes());

/* ...
[120] => string(103) "struct Tracking {
 string Language;
 string Login;
 string Password;
 string Type;
 string Documents;
}"
[121] => string(51) "struct TrackingResponse {
 ResultTracking return;
}"
[24] => string(81) "struct ResultTracking {
 TrackingInfo Items;
 boolean Error;
 string ErrorInfo;
}"
[28] => string(227) "struct TrackingInfo {
 boolean Error;
 string Type;
 string Number;
 string Info;
 string AgentURL;
 dateTime CreateDate;
 string State;
 dateTime DeliveryDate;
 string DeliveryInfo;
 TrackingEvent History;
 Waybill Waybills;
}"
[27] => string(83) "struct TrackingEvent {
 dateTime EventDate;
 string EventName;
 string EventInfo;
}"
[31] => string(546) "struct Waybill {
 string Type;
 string Number;
 dateTime CreateDate;
 string State;
 dateTime DeliveryDate;
 string Sender;
 string SenderGeography;
 string Recipient;
 string RecipientGeography;
 string RecipientAddress;
 dateTime SendDate;
 string Payer;
 int CargoQty;
 float NetWeight;
 float GrossWeight;
 string ConsolidationNumber;
 string InventoryWaybillNumber;
 string DeliveryMethod;
 float Volume;
 boolean RequirePaymentInCash;
 float PaymentInCash;
 string PaymentInCashCurrency;
 string RecipientOfficial;
 TrackingEvent History;
}"
... */

Единственное отличие от самостоятельного анализа wsdl — не указано, какие поля необязательные, какие можно заполнять null и являются ли какие-то поля массивами.

If an error occurs during processing, the response to a SOAP message is a SOAP fault element in the body of the message, and the fault is returned to the sender of the SOAP message.

The SOAP fault mechanism returns specific information about the error, including a predefined code, a description, and the address of the SOAP processor that generated the fault.

Points to Note

• A SOAP message can carry only one fault block.

• Fault is an optional part of a SOAP message.

• For HTTP binding, a successful response is linked to the 200 to 299 range of status codes.

• SOAP Fault is linked to the 500 to 599 range of status codes.

Sub-elements of Fault

The SOAP Fault has the following sub elements −

SOAP Fault Codes

The faultCode values defined below must be used in the faultcode element while describing faults.

SOAP Fault Example

The following code is a sample Fault. The client has requested a method named ValidateCreditCard, but the service does not support such a method. This represents a client request error, and the server returns the following SOAP response −

<?xml version = '1.0' encoding = 'UTF-8'?>
<SOAP-ENV:Envelope
   xmlns:SOAP-ENV = "http://schemas.xmlsoap.org/soap/envelope/"
   xmlns:xsi = "http://www.w3.org/1999/XMLSchema-instance"
   xmlns:xsd = "http://www.w3.org/1999/XMLSchema">

   <SOAP-ENV:Body>
      <SOAP-ENV:Fault>
         <faultcode xsi:type = "xsd:string">SOAP-ENV:Client</faultcode>
         <faultstring xsi:type = "xsd:string">
            Failed to locate method (ValidateCreditCard) in class (examplesCreditCard) at
               /usr/local/ActivePerl-5.6/lib/site_perl/5.6.0/SOAP/Lite.pm line 1555.
         </faultstring>
      </SOAP-ENV:Fault>
   </SOAP-ENV:Body>
</SOAP-ENV:Envelope>