uml - Use cases Extends and include - Stack Overflow

I have a not completed diagram of e-commerce order I am not sure of the include and extend relatationship Does this diagram is correct for the attached flow

UML Stereotypes: Diagramming Style Guidelines

uml - Can a use case be both an extension and an inclusion

requirements - Are using <> and <> relationship

Use case generalization versus extension - Stack Overflow.pdf

Is my use case UML diagram too complicated? - Software Engineering

uml - Extend and include in file system - Stack Overflow

Major elements of business use case UML diagram.

Uml uses case diagram suggestion - Stack Overflow

1. Modeling Systems - Threat Modeling [Book]

uml - Can an extended use case have a relationship with another