[fw-server] Soap help... Please!

Soap has just been killing me! Here's the wsdl that i'm trying to respond to:
<s:element name="DeleteCustomerProfile">
<s:complexType>
<s:sequence>
<s:element minOccurs="0" maxOccurs="1" name="merchantAuthentication" type="tns:MerchantAuthenticationType"/>
<s:element minOccurs="1" maxOccurs="1" name="customerProfileId" type="s:long"/>
</s:sequence>
</s:complexType>
</s:element>

So I did:
$soapclient->DeleteCustomerProfile($methant_authentication, $customerProfile);

Anyone see what I did wrong? Or do I need to provide more info

Thanks in advance