Hmmm. not sure what the issue is that you're seeing, but I am able to pull down your project and see the actiontext.

How did you start the rails server? You should use bin/dev since that will start the rails app, css and js assets monitoring.

 ☒ Are you referring to Tailwind UI? 

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'},
  ],
})