A chain of restaurants need an central online order processing system. detail requirement as follows;
Should inlcude all functions what [url removed, login to view] has plus below:
1. User enter website by enter their us zip code. After zip code entered, tell user whether food will be delivered in their area or not.
2. If yes, show menu by a standard menu, or by restaurant that delivery to their area under a category (Chinese Food, Italian, Indian, etc).
3. User can only order their food from one restaurant except standard menu.
1. Get email notification when an order placed.
2. affiliate restaurant open their account online but need approved and update their menu and pricing.
3. Run a report showing order history and current orders from their menu if any.
... etc features to come.
You may customize oscommerce to achieve the requirement.