old_contents: var currencies = require('../data/currencies.js');
  module.exports = {
    stripe: Object.keys(currencies),
    paypal: Object.keys(currencies).filter(function(i) {
      if (!currencies[i].hasOwnProperty('disabled')) {
        return i;
      }
    })
  };
  
new_contents: var currencies = require('../data/currencies.js');
  module.exports = {
    stripe: Object.keys(currencies),
    paypal: Object.keys(currencies).filter(function(i) {
      return currencies[i].disabled !== 'paypal';
    })
  };
  
subject: Update the logic