I am trying to send a SOAP request to a client's API endpoint. I am not at all familiar with SOAP, so having quite a difficult time getting this to work.

From the client's documentation

```
The requested ticket can be used to call all the API web methods subsequently.

    public string RequestTicket( 
        string username,
        string password
    );

URL
    https://www.clientsurl.net/api/v01_00/APIService.asmx?wsdl

Parameters
    string username 
    string password

```

I am able to create the WSDL

```
    $client = new Client('https://www.clientsurl.ca/api/v01_00/APIService.asmx?wsdl', ['soap_version' => SOAP_1_1]);

```

but not sure how to send the parameters through

```
    $params = [
        'username' => 'myusername' 
        'password' => 'mypassword' 
    ];

```

I am also not sure what the relevance of `RequestTicket` is. Am I supposed to add it to the url?

The answer is probably very simple, but after tons of searching I couldn't find anything. Please help.