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Some setup you must do manually if you haven't yet:
1. Register your Rails application on: https://dashboard.stripe.com/register 2. Update the stripe PUBLISHABLE_KEY in "config/initializers/stripe.rb" For example: Stripe.api_key = ENV['STRIPE_SECRET_KEY'] 3. Update stripe PUBLISHABLE_KEY in the "views/stripe/checkouts/create.js.erb" For example: var stripe = Stripe(ENV["STRIPE_PUBLISHABLE_KEY"]); 4. Update "controllers/stripe/checkouts_controller.rb" with stripe checkout line_items, success and failure callback URLs. 5. Go to: http://localhost:3000/stripe/checkout and try the checkout flow.