Define JSON request payloads for every use case and the expected JSON responses for the following: Use Case$1$: Freeze byer account

Participating actor: Admin & Buyer

Entry Condition: Buyer has an active account

Exit Criteria: Buyer account is frozen, and the buyer can only log in by request unfreezing.

Flow of events:

$1.$ Admin logs into the system.

$2.$ Admin select buyer account and froze the buyer$$s account

$3.$ System updates buyer account status to frozen.

$4.$ Buyer receives notification that account has been frozen

Use Case$2$: Unfreeze buyer Account

Participating actor: Admin & Buyer

Entry condition: Buyer account is frozen

Exit Criteria: Buyer account is active and can access account again

Flow of events:

$1.$ Buyer tries login to the account and requests for unfreezing account.

$2.$ Admin go to buyers account management and unfreeze it$.$

$3.$ System updates buyers account to active.

Use Case $3$: Freeze Seller Account

Participating actor: Admin & Seller

Entry condition: Seller account exists and is active

Exit Criteria: Seller account is frozen, and seller can only log in to request unfreezing.

Flow of events:

$1.$ Admin navigate to seller account management section and select seller account to frozen

$2.$ System updates the seller account to status frozen

$3.$ Seller receives a notification that account has been frozen

Use Case $4$: Unfreeze Seller Account

Participating actor: Admin & Seller

Entry condition: seller account is frozen

Exit Criteria: Seller account is restored to active again

Flow of events:

$1.$ Admin select seller account and change status to active

$2.$ System updates seller account to status active

$3.$ Seller receive a notification that account is active

Use Case $5$: Freeze Item

Participating actor: Admin

Entry condition: Item is currently on sale

Exit Criteria: Item is frozen, and no new bids can be placed

Flow of events:

$1.$ Admin navigates to item management section and change the item to frozen

$2.$ System updates the item status to frozen

$3.$ Item cannot receive new bids

$4.$

Use Case $6$: Unfreeze Item

Participating actor: Admin

Entry condition: Item is frozen

Exit Criteria: Item is on sale again and can receive new bids again

Flow of events:

$1.$ Admin navigate to item management section and change item status to unfreeze

$2.$ System updates the item status to active.

Use Case $7$: Generate Auction Report

Participating actor: Admin