Igniter Installer

Beta: The Igniter installer is new and under active testing. If you hit an issue, please open a bug report. You can always fall back to manual installation.

The Igniter installer configures tiger_stripe in a Phoenix project with a single command. It adds a small runtime wrapper module, starts the Finch pool, wires up webhook verification, scaffolds a controller, and adds the route.

Prerequisites

Your project needs Igniter installed. If you don't have it yet:

# mix.exs
{:igniter, "~> 0.7"}

Running the Installer

mix igniter.install tiger_stripe

If tiger_stripe is already in your deps, run the configuration task directly:

mix tiger_stripe.install

Both commands do the same thing. The only difference is that igniter.install also adds the dependency to your mix.exs.

What It Does

The installer makes five changes to your project. Igniter shows a unified diff of every change and asks for confirmation before writing anything.

1. Runtime Wrapper

Adds a helper module for constructing clients and resolving webhook secrets:

defmodule MyApp.Stripe do
  def client do
    Stripe.client(System.fetch_env!("STRIPE_SECRET_KEY"))
  end

  def webhook_secret do
    System.fetch_env!("STRIPE_WEBHOOK_SECRET")
  end
end

2. Finch Supervision

Adds the default Stripe.Finch pool to your application supervision tree:

children = [
  Stripe
]

Your deployment environment needs STRIPE_SECRET_KEY and STRIPE_WEBHOOK_SECRET set.

3. Webhook Plug

Injects Stripe.WebhookPlug into your Phoenix endpoint, directly before Plug.Parsers:

# lib/my_app_web/endpoint.ex

plug Stripe.WebhookPlug,
  secret: {MyApp.Stripe, :webhook_secret, []},
  path: "/webhook/stripe"

plug Plug.Parsers,
  parsers: [:urlencoded, :multipart, :json],
  ...

The plug must come before Plug.Parsers because it needs the raw request body for signature verification. Plug.Parsers consumes the body, so anything after it cannot verify the signature.

If your project has multiple endpoints, Igniter will prompt you to choose which one to modify.

4. Webhook Controller

Scaffolds a controller at lib/<app>_web/controllers/stripe_webhook_controller.ex:

defmodule MyAppWeb.StripeWebhookController do
  use MyAppWeb, :controller

  def handle(conn, _params) do
    event = conn.assigns.stripe_event

    case event.type do
      "checkout.session.completed" -> ...
      "invoice.payment_succeeded"  -> ...
      "invoice.payment_failed"     -> ...
      "customer.subscription.deleted" -> ...
      unhandled -> Logger.info("Unhandled Stripe event: #{unhandled}")
    end

    send_resp(conn, 200, "ok")
  end
end

Each event handler is a stub that logs the event ID. Replace them with your business logic. See the Webhooks guide for details on event handling patterns.

5. Webhook Route

Adds a route to your Phoenix router:

scope "/webhook" do
  post "/stripe", MyAppWeb.StripeWebhookController, :handle
end

The path /webhook/stripe matches the :path option configured on the plug. If your project has multiple routers, Igniter will prompt you to choose.

After Installation

1. Set Stripe environment variables:

   STRIPE_SECRET_KEY=sk_live_...
   STRIPE_WEBHOOK_SECRET=whsec_...

2. Create a webhook endpoint in the Stripe Dashboard pointed at https://your-domain.com/webhook/stripe

3. Customize the controller event handlers with your business logic

4. Test locally with the Stripe CLI:

   stripe listen --forward-to localhost:4000/webhook/stripe

Re-running the Installer

The installer is safe to run multiple times:

• The wrapper module is only created if it does not already exist
• The Finch child is only added if it is not already present
• The controller is only created if the module doesn't exist
• The webhook plug is only injected if not already in the endpoint

If you need to reset and re-run, delete the generated controller file and remove the plug/route/wrapper lines manually, then run the installer again.

Non-Phoenix Projects

If no Phoenix endpoint or router is found, the installer skips the plug, controller, and route steps. You still get the wrapper module, plus notices explaining how to set up webhook handling manually. See the Webhooks guide for the manual setup instructions.

Dry Run

Preview changes without writing anything:

mix tiger_stripe.install --dry-run