How to structure restaurant menu APIs for third-party display platforms?

Hi everyone,
I’m currently working on a food-based project where I want to fetch restaurant menus dynamically to display on third-party platforms in an organized way. I’m particularly focused on chains like Mellow Mushroom, where the menu changes based on location, offers, and timing.

I’d appreciate suggestions or examples on how to structure the API response for:

Categorized menu items (starters, pizzas, beverages)
Customization (extra toppings, crust types)
Location-based menu filtering

Also, if anyone has seen a well-structured implementation of this in action, feel free to share examples. I found one menu reference helpful here:
Mellow Mushroom Menu — This gives a good idea of how a clean display could look on the frontend.