code: func (call *AddLIFFCall) Do() (*LIFFIDResponse, error) {
  	var buf bytes.Buffer
  	if err := call.encodeJSON(&buf); err != nil {
  		return nil, err
  	}
  	res, err := call.c.post(call.ctx, APIEndpointAddLIFFApp, &buf)
  	if err != nil {
  		return nil, err
  	}
  	defer closeResponse(res)
  	return decodeToLIFFIDResponse(res)
  }
docs: // Do method