Lambda Telegram Notification for RevenueCat Events

This project implements an AWS Lambda function that processes RevenueCat webhook events and sends notifications to a Telegram channel. It also provides a daily summary of events at midnight Jakarta time.

Features

• Real-time notifications for RevenueCat events (purchases, renewals, cancellations, etc.)
• Daily summary of events sent at midnight Jakarta time
• In-memory data storage for efficient processing
• Easy setup using AWS Lambda and EventBridge

Prerequisites

• An AWS account with access to Lambda and EventBridge
• A Telegram bot token and channel ID
• A RevenueCat account with webhook configuration

Setup

1. Create a Lambda Function

1. Go to AWS Lambda console and create a new function.
2. Choose Python 3.8 or later as the runtime.
3. Copy the code from lambda_function.py in this repository to your Lambda function.

2. Configure Environment Variables

In the Lambda function configuration, add the following environment variables:

• TELEGRAM_BOT_TOKEN: Your Telegram bot token
• TELEGRAM_CHANNEL_ID: Your Telegram channel ID

3. Set Up EventBridge Rule

1. Go to Amazon EventBridge console and create a new rule.
2. Set the rule to run on a schedule.
3. Use the following cron expression to run at midnight Jakarta time (5pm UTC): 0 17 * * ? *
4. Set the target as your Lambda function.

4. Configure RevenueCat Webhook

In your RevenueCat dashboard:

1. Go to Project Settings > Integrations.
2. Add a new webhook.
3. Set the URL to your Lambda function's invoke URL.
4. Select the events you want to receive notifications for.

Usage

Once set up, the system will automatically:

• Send individual notifications to your Telegram channel for each RevenueCat event.
• Send a daily summary at midnight Jakarta time.

Resetting Data

To reset the in-memory data, invoke the Lambda function with the following test event:

{
  "action": "reset_data"
}

Customization

You can modify the lambda_function.py file to customize:

• The format of individual event messages
• The content of the daily summary
• The timezone for the daily summary (currently set to Asia/Jakarta)

Contributing

Contributions are welcome! Please feel free to submit a Pull Request.

License

This project is licensed under the MIT License - see the LICENSE file for details.