Are you able to run bundle install from within the running container?

They may have changed the api again. I stopped using their Stripe Payments solution and prefer the Stripe Checkout. But, if this is the route you want to go. see this resource of their latest API docs. https://stripe.com/docs/api/subscriptions/create

Stripe::Subscription.create({
  customer: 'CUSTOMER_NUMBER',
  items: [
    {price: 'price_1aUj7wdGdu1FeVHa2AEY0Rph'},
  ],
})

Ah, the image isn't clickable, but you can try to click on the title.

I'm working on a beginners course that should be released sometime this year.

 ☒ You are correct! Having the bundle volume doesn't map to your development machine's bundle directory. Honestly, I don't think I would want to do this anyways since there are some gems that compile native extensions. Since I develop on a macOS machine, doing this could introduce unexpected errors from the compiled gems. Having the bundle volume is still useful though if you have multiple services that rely on the application code (sidekiq, jsbundling, and cssbundling). So, when you run bundle in the app docker container, the installed gems would be available to the other services.

It's just a preference for than anything. I could have a conditional, but this felt cleaner.