How can I set headers when Extending a class?

[Sigularusrex]

How can I set headers when using extend Savon::Model in a class?

I can see how this is done in version1, but version2 has no documentation about it (that I have found)

Thanks

[Sigularusrex]

Ok, I've seen another question which happens to have sample code to answer this.
Using self.class.client in initialize

Example

 def initialize
     self.class.client wsdl: "http://api.example.com/v1/example?wsdl",
                       log: true,
                       log_level: :debug,
                       pretty_print_xml: true,
                       soap_header: {
                           "UserAuthentication" => {
                               Id: 11111,
                               Password: "!!!!!!"
                           }
                       }
   end

Additionally what confused me is I need to use soap_header: when the documentation for version 2 says to use headers:

[oranges13]

Be careful using self.class.client as it appears Savon does not properly sanitize attributes between requests. See #789 for more info.

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