# CheckPrice Server

Node.js Express server that checks eBay prices and notifies via Telegram.

## Features

- Runs a scheduled check every minute
- Gets eBay access token automatically using refresh token
- Searches eBay items by keyword
- Notifies Telegram group when items are found below price threshold ($650 USD)

## Setup

1. Install dependencies:
   ```bash
   npm install
   ```

2. Configure `.env` file:
   ```
   EBAY_CLIENT_ID=your_client_id
   EBAY_CLIENT_SECRET=your_client_secret
   EBAY_REFRESH_TOKEN=your_refresh_token
   TELEGRAM_BOT_TOKEN=your_bot_token
   TELEGRAM_CHAT_ID=your_chat_id
   PORT=3000
   ```

3. Run the server:
   ```bash
   npm start
   ```

## Configuration

- **PRICE_THRESHOLD**: Edit in `src/index.js` to change the price threshold (default: $650 USD)
- **Keywords**: Edit the `keywords` array in the cron job section to search for different items

## API Endpoints

- `GET /health` - Health check
- `POST /check` - Manual trigger with keyword
  ```json
  { "keyword": "your-search-term" }
  ```

## How It Works

1. Every minute, the server runs `checkAndNotify()` function
2. Calls `getEbayAccessToken()` to get a valid access token
3. Calls `searchEbayItems()` to search eBay for items
4. Filters items with price below $650 USD
5. Sends notification to Telegram if cheap items found