Implement endpoints in frontend (UpdateGuestWebUI)

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Pre-checklist

• I have searched for, and did not find, an existing issue at the top-level.

Stories

Story 1: As a developer I want to implement the backend endpoints so that the frontend's web UI can post data to the backend and access data from the backend.

Ready checklist

• Independent (of other issues in flow)
• Negotiable (and negotiated)
• Valuable (the value to an identified role has been identified)
• Estimable (the size of this story has been estimated using /weight value or the menu on the right)
• Small (can be completed in 50% or less of a single iteration)
• Testable (has testable acceptance criteria)

Also

• Appropriate role labels have been applied (e.g., role:*).
• Relevant activity labels have been applied (e.g., activity:*).
• Linked to related issues, epics, and milestones.

Diagrams

Acceptance Criteria

Scenario: [3-5 word description of scenario]
  Given backend is created.
  When creating web UI.
  Then implement backend endpoints.

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