Do UML drawing a valid cafeteria system attached : I need help I've written the script to make a cafeteria system at college. I drew the painting but I want to check the authenticity of the painting, especially the shares of the operations

The student selects one of the restaurants available in the cafeteria.
The student selects the item you want with the possibility of adding some ingredients to the item and receive the sellers.
The student pays to the seller. The delivery of a request is included, an update to the store at the moment the student is paid.
The seller's issue the invoice to the student and includes an addition to the account of exports and imports of the restaurant.
Administrator for the restaurant When you want to add new item, the sellers are notified of the new item added.
Administrator records attendance and absence of sellers.

thank you

[enter image description here][1]



  [1]: https://i.stack.imgur.com/DaRQ6.jpg