Online Retail Register Account Example | AI Sequence Diagram Refinement Tool

For an online retail platform, account registration is the first step in building a customer relationship. The Register Account scenario describes how a shopper submits details, receives feedback on errors, and has their information stored securely. With the Sequence Diagram Refinement Tool, this straightforward process can be expanded into MVC layers that reveal the link between form handling, validation, and backend services.

01 | Diagram Input

Provide your Mermaid or PlantUML sequence diagram that represents the account registration workflow. If you do not have one ready, the MVC System Architecture Generator can instantly create a starting diagram for you.

Sequence Diagram PlantUML Example:

@startuml
actor Customer
participant "Registration UI" as UI
participant "Account Service" as Service
participant "Database" as DB
participant "Email Service" as Mail

Customer -> UI: Click "Register"
UI -> Customer: Show registration form
Customer -> UI: Enter details
Customer -> UI: Submit form
UI -> Service: Send registration data

alt Invalid input format / weak password
Service --> UI: Show field errors
Customer -> UI: Correct and resubmit
else Email already registered
Service --> UI: Show "Email exists" message
UI --> Customer: Prompt login or reset password
else Valid input
Service -> DB: Create account record
DB --> Service: Success / Error
alt DB error
Service --> UI: "Unexpected error, try later"
else Account created
Service -> Mail: Send verification email
alt Email send failure
Mail --> Service: Failed
Service --> UI: Notify failure, retry later
else Email sent
Mail --> Service: Success
end
Service --> UI: Auto-login + redirect homepage
UI --> Customer: Show welcome page
end
end

@enduml

02 | Rendered Sequence Diagram

Click Render Diagram to display the initial registration flow. You can save this view as SVG or adjust the design directly in Visual Paradigm Online. To transition into the AI refinement stage, select Decompose Layers.

03 | Decomposed Architecture Layers

The AI interprets the flow and identifies the MVC components. In this case, it may detect:

• View Objects: RegistrationForm, FieldValidator, ErrorDisplay, …
• Model Objects: AccountService, DatabaseAccess, EmailService, …

04 | Detailed MVC Sequence Diagram

The AI then generates a more elaborate diagram, showing how form fields are validated, errors reported, and account data saved while triggering email notifications. The diagram can be exported as an SVG or further tailored in Visual Paradigm Online.