Example use-cases?

[MileanCo]

Are there any examples of how to use this API?

I tried this:

var paywhirl = require('paywhirljs')( {
  api_key: Meteor.settings.public.paywhirl_api_key,
  api_secret: Meteor.settings.paywhirl_secret_key
});

and

import 'paywhirljs';
var paywhirl = new PayWhirl({
  api_key: Meteor.settings.public.paywhirl_api_key,
  api_secret: Meteor.settings.paywhirl_secret_key
});

But neither one is working.

[MileanCo]

I was able to get it working by doing this:
let paywhirl = require('paywhirljs')({ api_key: Meteor.settings.public.paywhirl_api_key, api_secret: Meteor.settings.paywhirl_secret_key });

But I had to edit your source code, by adding
'use strict';
At the top of every file in
paywhirljs/lib/resources

I'm using ES6 on MeteorJS (node)