The `save!` in the rescue block is just to save off the error message from Stripe, since retrying after a Stripe-level error isn't possible because the token th

The `save!` in the rescue block is just to save off the error message from Stripe, since retrying after a Stripe-level error isn't possible because the token that you get from `stripe.js` is one-time-use and is consumed as soon as Stripe sees you make an API call. SuckerPunch won't actually retry the job. In this simple example the backgrounding mechanism is mostly for insulating you from the browser's timeout.