Build WhatsApp Business API Bidding for Vehicle Procurement

Project Brief
We need a developer to implement a WhatsApp Business API (Meta) bidding/auction flow for our logistics procurement.

When an order is confirmed in our “Daily Order Book” dashboard, it should be sent to eligible vendors (mapped by From/To/Vehicle Type). Vendors bid via WhatsApp (structured), can improve bids, and our dashboard shows live L1/L2/L3 rankings. After close, we award a winner and get vehicle confirmation via WhatsApp.

Deliverables (Phase 1)

WhatsApp Business API integration (templates + webhooks)

Auction creation/publish/close logic

Vendor mapping logic (eligibility rules)

Bid capture + validation + bid improvements

Ranking engine (L1/L2/L3) + bid history

APIs for dashboard to display bids + status

Award + winner confirmation flow

Documentation + basic tests

Key constraints

Official WhatsApp Business API only (no unofficial automation)

Vendors must not see competitor identity/rates beyond allowed rules

Please include

Relevant WhatsApp API examples

Timeline estimate + fixed quote in INR (milestone breakup)

Suggested architecture for real-time updates