> ## Documentation Index
> Fetch the complete documentation index at: https://docs.corrily.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Sample app guide

> How we created the Node.js sample app.

This guide walks you through how we created the Corrily sample app in Node.js. The sample app demonstrates how to:

* Use Corrily's [Calculate price](../api-reference/calculate-price) API to present optimal prices to visitors based on their location
* Charge custom subscription prices in Stripe Checkout
* Notify Corrily of subscription and invoice events so that it can determine if the prices that it's presenting to your users are optimal

Here's a [live demo](https://corrily.glitch.me/) of the sample app and the full [source code](https://glitch.com/edit/#!/corrily). The recipe at the bottom of this page provides a step-by-step walkthrough of how the sample app's code works.

## Set up your Stripe account

Here is how we set up our Stripe account when creating the demo:

1. Sign up for a [Stripe](https://stripe.com) account.
2. Log in to the [Stripe Dashboard](https://dashboard.stripe.com).
3. Open the **Products** page of the Stripe Dashboard.
4. Click **Add product**.
5. Enter `Corrily` for the product's **Name**.
6. Under **Price information** set **Price** to `10`.
7. Keep the default values for the rest of the
   fields (**Pricing model**: `Standard pricing`, `Recurring`, **Billing period**: `Monthly`, **Usage is metered**: disabled).
8. Scroll to the bottom of the page and click **Add another price**.
9. Set **Price** to `100` (`USD`).
10. Set **Billing period** to `Yearly`.
11. Leave the rest of the values the same as before.
12. Click **Save product**. Stripe takes you to the **Overview** page for your new product.
13. Under the **Details** section note your product **ID**. It should look similar to this: `prod_XXXXXXXXXX`
14. Under the **Pricing** section note your **API ID** values. You should have one for your monthly pricing option and another one for your yearly pricing option. They should look like this: `price_XXXXXXXXXX`

## Set up your Corrily account

See [Setup](../basics/setup).