Integrate Just Eat Takeaway Order Management API to receive orders, send confirmations, and push preparation time updates for a POS integration

Verified steps

1. Authenticate to the Just Eat Takeaway partner API using the API key issued during partner onboarding and confirm access to the order management endpoints for your restaurant IDs
2. Register an order notification endpoint that Just Eat will POST new orders to, and respond with an HTTP 200 within the acceptance SLA window to confirm receipt
3. Parse the incoming order payload extracting the order_id, items array with product references, and the requested_for timestamp indicating the customer's expected delivery time
4. Inject the order into the POS and return a confirmation payload to Just Eat's order acknowledge endpoint including a preparation_time_minutes value reflecting current kitchen load
5. As the order progresses, POST status update events (accepted, being_prepared, ready_for_collection) to the Just Eat order status endpoint using the order_id
6. For cancelled orders, POST a rejection event with a rejection_reason_code and confirm the consumer-facing cancel notification is triggered on the Just Eat platform