/* em requisições com o content-type multipart/form-data, mapas com a chave do tipo String serão automaticamente serializados. */
@Path("/customers/{id}/picture") @Post
String uploadPictureToCustomer(@PathParameter id, @BodyParameter Map<String, Object> parameters);
MyApi myApi = new RestifyProxyBuilder()
Map<String, Object> parameters = new HashMap<>();
parameters.put("picture_name", "main-image");
parameters.put("picture", new File("/path/to/file/picture.jpg"));
Customer customer = myApi.uploadPictureToCustomer("1", parameters);