BYOD flow

On page load

sequenceDiagram
  participant App Service
  participant Config Server
  participant Shop Server
  participant POS

  App Service->>+Config Server: Use the token to exchange<br/>the table number after page load
  Config Server->>+Shop Server: Pass the request to shop via a tunnel
  Shop Server-->>-Config Server: Return the validation result
  Config Server-->>-App Service: Use the table number to load order<br/>or display an error
  App Service->>Config Server: Get the config like the theme, buffet menu, etc.
  App Service->>+Config Server: Load the table order to ensure the table is ready
  Config Server->>+Shop Server: Pass the request to shop via a tunnel
  Shop Server->>+POS: Get the detail of the table
  POS-->>-Shop Server: Return the detail of the table
  Shop Server-->>-Config Server: Return the detail of the table
  Config Server-->>-App Service: Serve regular menu or buffet menu<br/>by checking the detail of the table

Place order

sequenceDiagram
  participant App Service
  participant Config Server
  participant Shop Server
  participant POS

  App Service->>+Config Server: Place the table order with an order token
  Config Server->>+Shop Server: Pass the request to shop via a tunnel
  Shop Server->>+POS: Return an error if the order token is in<br/>the success list or the pending list.<br/>Pass to POS if not in the success list<br/>and the pending list.
  POS-->>-Shop Server: Return a status
  Shop Server-->>-Config Server: Return the status
  Config Server-->>-App Service: Display the success message or the error message