This exists in india already

The food delivery apps (zomato, Swiggy) support "agentic shopping" through an MCP server.

You can reserve a small amount of money in UPI apps that doesn't need any approval to be debited (only by a specific merchant).

Razorpay which is a payment gateway has an MCP server

So you can add razorpay in your app, and claude can pay.

Claude can access the Swiggy MCP server and search using natural language there.

The incentive for the food delivery app to participate in this is better targeted ads.