feat: Subscriptions with Stripe function

node/subscriptions-with-stripe/.gitignore

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node/subscriptions-with-stripe/.prettierrc.json

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+{
+  "trailingComma": "es5",
+  "tabWidth": 2,
+  "semi": true,
+  "singleQuote": true
+}

node/subscriptions-with-stripe/README.md

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+# 💳 Node.js Stripe Subscriptions Function
+
+Integrates Stripe subscriptions into your Appwrite project. Collect card payment with the `/subscribe` endpoint and check the status of a user subscription using the `Subscriptions` collection.
+
+## 🧰 Usage
+
+### `POST /subscribe`
+
+This endpoint initiates a Stripe checkout session for a subscription. The user ID is fetched from the headers of the request. If the user ID is not found or a Stripe checkout session could not be created, the request will be redirected to a cancel URL.
+
+**Parameters**
+
+| Name               | Description            | Location | Type   | Sample Value |
+| ------------------ | ---------------------- | -------- | ------ | ------------ |
+| x-appwrite-user-id | User ID from Appwrite. | Header   | String | 642...7cd    |
+| Content-Type       | The content type of the request body | Header   | `application/json` | N/A |
+| successUrl         | The URL to redirect to after a successful payment. | Body   | String | https://example.com/success    |
+| failureUrl         | The URL to redirect to after a cancelled payment attempt. | Body   | String | https://example.com/failure    |
+
+**Response**
+
+Sample `303` Response:
+
+The response is a redirect to the Stripe checkout session URL or to the cancel URL if an error occurs
+
+```text
+Location: https://checkout.stripe.com/pay/cs_test_...#fidkdWxOYHwnP
+```
+
+```text
+Location: https://mywebapp.com/cancel
+```
+
+### `POST /webhook`
+
+This endpoint is a webhook that handles two types of events from Stripe: `customer.subscription.created` and `customer.subscription.deleted`. It validates the incoming request using the Stripe's validateWebhook method. If the validation fails, a `401` response is sent.
+
+**Parameters**
+
+| Name | Description                  | Location | Type   | Sample Value                                                          |
+| ---- | ---------------------------- | -------- | ------ | --------------------------------------------------------------------- |
+| None | Webhook payload from Stripe. | Body     | Object | [See Stripe documentation](https://stripe.com/docs/api/events/object) |
+
+**Response**
+
+Sample `200` Response:
+
+In case of `customer.subscription.created` event, it gives user `subscriber` label.
+In case of `customer.subscription.deleted` event, it takes `subscriber` label away from user.
+
+```json
+{ "success": true }
+```
+
+Sample `401` Response:
+
+```json
+{ "success": false }
+```
+
+## ⚙️ Configuration
+
+| Setting           | Value           |
+| ----------------- | --------------- |
+| Runtime           | Node (18.0)     |
+| Entrypoint        | `src/main.js`   |
+| Build Commands    | `npm install`   |
+| Permissions       | `any`           |
+| Timeout (Seconds) | 15              |
+
+> If using a demo web app to subscribe, make sure to add your function domain as a web platform to your Appwrite project. Doing this fixes CORS errors and allows proper functionality.
+
+## 🔒 Environment Variables
+
+### APPWRITE_API_KEY
+
+Your Appwrite project's API key.
+
+| Question      | Answer                                                                                                                                    |
+| ------------- | ----------------------------------------------------------------------------------------------------------------------------------------- |
+| Required      | Yes                                                                                                                                       |
+| Sample Value  | `083d341ee48...`                                                                                                                          |
+| Documentation | [Appwrite: Create an API key](https://appwrite.io/docs/keys#:~:text=To%20create%20a%20new%20API,scope%20to%20grant%20your%20application.) |
+
+### APPWRITE_ENDPOINT
+
+The endpoint where your Appwrite server is located. If not provided, it defaults to the Appwrite Cloud server: `https://cloud.appwrite.io/v1`.
+
+| Question     | Answer                         |
+| ------------ | ------------------------------ |
+| Required     | No                             |
+| Sample Value | `https://cloud.appwrite.io/v1` |
+
+### STRIPE_SECRET_KEY
+
+Secret for sending requests to the Stripe API.
+
+| Question      | Answer                                           |
+| ------------- | ------------------------------------------------ |
+| Required      | Yes                                              |
+| Sample Value  | `sk_test_51J...`                                 |
+| Documentation | [Stripe: API Keys](https://stripe.com/docs/keys) |
+
+### STRIPE_WEBHOOK_SECRET
+
+Secret used to validate the Stripe Webhook signature.
+
+| Question      | Answer                                               |
+| ------------- | ---------------------------------------------------- |
+| Required      | Yes                                                  |
+| Sample Value  | `whsec_...`                                          |
+| Documentation | [Stripe: Webhooks](https://stripe.com/docs/webhooks) |

node/subscriptions-with-stripe/env.d.ts

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+declare global {
+  namespace NodeJS {
+    interface ProcessEnv {
+      APPWRITE_ENDPOINT?: string;
+      APPWRITE_FUNCTION_PROJECT_ID: string;
+      APPWRITE_API_KEY: string;
+      STRIPE_SECRET_KEY: string;
+      STRIPE_WEBHOOK_SECRET: string;
+    }
+  }
+}
+
+export {};