def ebay_call(call, arguments = {})
      raise "#{self} has no eBay token" unless ebay_token
      Ebayr.call(call, arguments.merge(:auth_token => ebay_token))
    end
def ebay_call(call, arguments = {})
      raise "#{self} has no eBay token" unless ebay_token
      Ebayr.call(call, arguments.merge(:auth_token => ebay_token))
    end
Shorthand for call(call, arguments.merge(:auth_token => this.ebay_token))
 Allows objects which mix in this module to use their own token.