j.rb

  def call(credentials)
    header_info = get_oauth_token(credentials)
    namespaces = {"ns0" => "https://www...", "ns1" => "https://www...",}
    client = Savon.client(wsdl: File.read('../endpoints/wsdl/....wsdl'),
                          endpoint: 'https://...',
                          namespaces: namespaces,
                          soap_header: {
                            "Authorization" => header_info[:token],
                            "csn" => "...",
                            "timestamp" => header_info[:timestamp],
                            "signature" => header_info[:signature],
                            "SOAPAction" => "/...",
                            "content-type" => "application/xml"
                          })

    client.call(:match_account_contact, message: {"ns0:MatchAccountContactRequest" => {
                  "ns0:Request" => {
                    "ns1:..." => "..."
                  },
                  "ns0:RequestContext" => {
                    "ns0:.." => "..."
                  },
                  "ns0:Account" => {
                    "ns0:.." => "..."
                  }})
  end