Edit.

app/client/handler.go

@@ -16,6 +16,26 @@ func (client *Client) GetHandlers(ctx context.Context) ([]models.EventHandler, e
 	return handlers, nil
 }
 
+func (client *Client) GetHandler(ctx context.Context, id int) (*models.EventHandler, error) {
+	var handler models.EventHandler
+	err := client.Fetch(ctx, "GET", fmt.Sprintf("/api/event-handlers/%d", id), &handler, nil)
+	if err != nil {
+		return nil, err
+	}
+
+	return &handler, nil
+}
+
+func (client *Client) PutHandler(ctx context.Context, handler *models.EventHandler) (*models.EventHandler, error) {
+	var response models.EventHandler
+	err := client.Fetch(ctx, "PUT", fmt.Sprintf("/api/event-handlers/%d", handler.ID), &response, handler)
+	if err != nil {
+		return nil, err
+	}
+
+	return &response, nil
+}
+
 func (client *Client) AddHandler(ctx context.Context, handler models.EventHandler) (*models.EventHandler, error) {
 	var result models.EventHandler
 	err := client.Fetch(ctx, "POST", "/api/event-handlers", &result, handler)