Using queryParams in Controller init()

@wasabigeek wrote:

What's the best way to make use of queryParams in a Controller's init() function? When I try something like this:

export default Ember.Controller.extend({
  queryParams: ['paymentId', 'PayerID'],
  paymentId: null,
  PayerID: null,
  init: function() {
    var paymentId = this.get('paymentId');
    var payerId = this.get('PayerID');
  }
});

When query parameters are specified in the URL, paymentId and payerId still return null in init(), I assume because it's run before the queryParams are checked.

Why do I want to do this? To execute a PayPal payment after being redirected:
https://developer.paypal.com/docs/integration/web/accept-paypal-payment/#execute-the-payment

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