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## On page load
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```mermaid
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sequenceDiagram
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participant App Service
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participant Config Server
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participant Shop Server
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participant POS
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App Service->>+Config Server: Use the token to exchange<br/>the table number after page load
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Config Server->>+Shop Server: Pass the request to shop via a tunnel
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Shop Server-->>-Config Server: Return the validation result
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Config Server-->>-App Service: Use the table number to load order<br/>or display an error
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App Service->>Config Server: Get the config like the theme, buffet menu, etc.
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App Service->>+Config Server: Load the table order to ensure the table is ready
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Config Server->>+Shop Server: Pass the request to shop via a tunnel
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Shop Server->>+POS: Get the detail of the table
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POS-->>-Shop Server: Return the detail of the table
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Shop Server-->>-Config Server: Return the detail of the table
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Config Server-->>-App Service: Serve regular menu or buffet menu<br/>by checking the detail of the table
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```
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## Place order
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```mermaid
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sequenceDiagram
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participant App Service
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participant Config Server
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participant Shop Server
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participant POS
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App Service->>+Config Server: Place the table order with an order token
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Config Server->>+Shop Server: Pass the request to shop via a tunnel
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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.
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POS-->>-Shop Server: Return a status
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Shop Server-->>-Config Server: Return the status
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Config Server-->>-App Service: Display the success message or the error message
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``` |
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\ No newline at end of file |
