You'd want to apply it to anything that hits the API and needs those. Otherwise, you'll have silent failures. Using pagerduty.coffee as example again:

* helper function for verifying https://github.com/github/hubot-scripts/blob/master/src/scripts/pagerduty.coffee#L208-L219
* call it where it's needed https://github.com/github/hubot-scripts/blob/master/src/scripts/pagerduty.coffee#L238-L239