Personal expense tracker

# 💰 Personal Expense Tracker API

## What This Workflow Does
Provides a complete expense tracking system with webhook API for adding expenses and automatic Google Sheets storage with daily summaries.

## How It Works
1. **API Endpoint**: Receives expenses via POST webhook
2. **Data Validation**: Ensures proper format and categories
3. **Google Sheets Storage**: Automatically saves to spreadsheet
4. **Daily Reports**: Sends summary at 8 PM daily
5. **Real-time Responses**: Returns success/error immediately

## API Usage
Send POST to: `/webhook/add-expense`
```json
{
  "amount": 25.50,
  "category": "Food",
  "description": "Lunch at cafe",
  "payment_method": "Credit Card"
}
```

## Categories
• Food • Transport • Shopping • Bills
• Entertainment • Health • Other

## Setup Required
1. Create Google Sheets with 'Expenses' sheet
2. Headers: Date | Category | Description | Amount | Payment Method
3. Replace SPREADSHEET_ID in nodes
4. Connect Google Sheets OAuth2
5. Activate workflow

## Perfect For
✅ Personal finance tracking
✅ Mobile app integration
✅ Family expense sharing
✅ Small business expense logging

**Includes automatic validation, error handling, and daily summaries.**