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stripe/webhooks_controller.rb

class WebhooksController < ApplicationController
  skip_before_action :verify_authenticity_token

  def stripe
    payload = request.body.read
    sig     = request.env["HTTP_STRIPE_SIGNATURE"]
    event   = Stripe::Webhook.construct_event(payload, sig, ENV.fetch("STRIPE_ENDPOINT_SECRET"))

    case event.type
    when "checkout.session.completed"
      CheckoutSessionCompleted.call(event.data.object)
    end

    head :ok
  rescue JSON::ParserError, Stripe::SignatureVerificationError
    head :bad_request
  end
end

Minimal, defensive, production-safe. Explained step-by-step in the lesson.