[New API] BuyWhere — Agent-native SEA e-commerce product catalog API

## API Submission

**API Name:** BuyWhere
**Docs URL:** https://api.buywhere.ai
**Category:** Shopping/Price Comparison
**Description:** BuyWhere is the agent-native product catalog API for Southeast Asia e-commerce. AI agents and MCP clients discover and route purchases to local merchants (Shopee, Lazada, Carousell) via structured product data feeds.
**Contact:** merchants@buywhere.ai