def call(data = {}, options = {})
      m = options.delete(:method)
      client.call m || method, href_template, data, options
    end
def call(data = {}, options = {})
      m = options.delete(:method)
      client.call m || method, href_template, data, options
    end
Make an API request with the curent Relation.

 @param data [Hash|String] The Optional Hash or Resource body to be sent.
   :get or :head requests can have no body, so this can be the options Hash
   instead.
 @param options [Hash] A Hash of option to configure the API request.
 @option options [Hash] headers: A Hash of API headers to set.
 @option options [Hash] query: Hash of URL query params to set.
 @option options [Symbol] method: Symbol HTTP method.
 @return [BookingSync::API::Response]