[1] x-callback-url Support – Contrast Tech Support ( (2013-11-16 04:03:50 +09:00 版)) <http://help.contrast.co/hc/en-us/articles/200611883-x-callback-url-Support>

[2] Dropbox Actions – Contrast Tech Support ( (2013-11-16 04:05:31 +09:00 版)) <http://help.contrast.co/hc/en-us/articles/200612283-Dropbox-Actions>