A commerce-centric demo featuring Agent Development Kit with Paypal Agent Toolkit via MCPs

- Demonstrates pre-sales conversational agent flow with PayPal APIs.
- Integrates Google ADK with PayPal Agent Toolkit via MCP.
- Covers order creation, tracking, shipment, and subscriptions.
- Includes product search and image-based recommendation.
- Uses PayPal sandbox for testing without real transactions.
- Supports A2A for adding remote external agents.

COPY 'env.example' into '.env' and set up the '.env file:
- Fill in either: your Google API Key, or your Google Cloud Project ID and Location
- Find and fill in Paypal Sandbox PAYPAL_CLIENT_ID and PAYPAL_SECRET

Insert orders info that actually exists in your Paypal sandbox:
- In function load_user_profile() within paypal_mcp_agent/util.py.
- Modify the user_profile and orders dictionaries.
They are loaded during before_agent_callback`.

This 4 minutes demo shows a quick conversational pre-sales engagement using PayPal's Agent Toolkit via MCP, and Google's Agent Development Kit.