Checkout — Operational Experience¶

End-to-end human journey for Checkout.
Modelled using the UC-BoK Experience Model (SPEC-016 / ADR-016).

Journeys¶

Journey	Actor	Touchpoint	Channel	Tasks	Type
Checkout — Cashier Journey	Cashier	`pos-terminal`	`in-store`	4	Happy path
Checkout — Online Customer Journey	Customer	`web-browser`	`online`	4	Happy path

End-to-End Sequence¶

Happy-path flow across all actors.

sequenceDiagram
    participant cashier as Cashier
    participant customer as Customer

    cashier->>SYS: Scan Items
    SYS-->>cashier: BasketUpdated
    cashier->>SYS: Apply Promotions
    SYS-->>cashier: PromotionsApplied
    cashier->>SYS: Capture Payment
    SYS-->>cashier: PaymentCaptured
    cashier->>SYS: Print Checkout Receipt
    SYS-->>cashier: ReceiptPrinted
    customer->>SYS: Review Basket
    SYS-->>customer: BasketReviewed
    customer->>SYS: Enter Shipping Details
    SYS-->>customer: ShippingDetailsCaptured
    customer->>SYS: Complete Online Payment
    SYS-->>customer: OrderPlaced
    customer->>SYS: Receive Order Confirmation
    SYS-->>customer: OrderConfirmed

Checkout — Cashier Journey¶

Standard staffed POS checkout journey executed by a cashier in store.


Actor	Cashier
Touchpoint	`pos-terminal`
Channel	`in-store`
Precondition	—
Postcondition	—

⚙️ Step 1 — Scan Items¶

Cashier scans each item barcode at the POS; the system adds line items to the basket and recalculates the running total.

Direction	Business Objects
Input	`product`, `basket`
Output	`basket`

Capabilities: checkout basket-management

Events: BasketUpdated

Interactions:

#	Interaction	Type	Input	Output	Event
1	Position Items for Scanning	👁️ review	`product`	`basket`	—
2	Scan Item Barcode	⚙️ execute	`product`	`basket`	`BasketUpdated`

⚙️ Step 2 — Apply Promotions¶

Cashier reviews automatically applied offers and scans or enters any coupon so the system can validate campaign rules and update the basket total.

Direction	Business Objects
Input	`basket`, `voucher`
Output	`basket`

Capabilities: promotions checkout

Events: PromotionsApplied

Interactions:

#	Interaction	Type	Input	Output	Event
1	Review Eligible Offers	👁️ review	`basket`	`basket`	—
2	Apply Coupon or Offer	⚙️ execute	`basket`	`basket`	`PromotionsApplied`

⚙️ Step 3 — Capture Payment¶

Cashier selects the tender type, captures payment, and the system authorises the transaction and completes the sale.

Direction	Business Objects
Input	`basket`, `payment`
Output	`order`, `payment`

Capabilities: payment-processing order-management checkout

Events: PaymentCaptured

Interactions:

#	Interaction	Type	Input	Output	Event
1	Select Tender Type	👁️ review	`basket`	`order`	—
2	Complete Payment	⚙️ execute	`basket`	`order`	`PaymentCaptured`

📢 Step 4 — Print Checkout Receipt¶

Cashier issues the receipt after payment is completed so the customer receives proof of purchase and payment details.

Direction	Business Objects
Input	`order`, `payment`
Output	`order`

Capabilities: checkout order-management

Events: ReceiptPrinted

Interactions:

#	Interaction	Type	Input	Output	Event
1	Choose Receipt Format	🔔 notify	`order`	`order`	`ReceiptPrinted` ←
2	Issue Receipt	✅ confirm	`order`	`order`	`ReceiptPrinted`

Checkout — Online Customer Journey¶

Online checkout journey covering basket review, shipping, payment, and order confirmation.


Actor	Customer
Touchpoint	`web-browser`
Channel	`online`
Precondition	—
Postcondition	—

👁️ Step 1 — Review Basket¶

Customer reviews basket lines, quantities, prices, and applied promotions before continuing to checkout.

Direction	Business Objects
Input	`basket`
Output	`basket`

Capabilities: basket-management checkout

Events: BasketReviewed

Interactions:

#	Interaction	Type	Input	Output	Event
1	Review Basket Lines	👁️ review	`basket`	`basket`	—
2	Confirm Basket for Checkout	✅ confirm	`basket`	`basket`	`BasketReviewed`

📥 Step 2 — Enter Shipping Details¶

Customer enters delivery address details and selects an available delivery option so the system can price and confirm fulfilment.

Direction	Business Objects
Input	`basket`, `customer`, `delivery-slot`
Output	`basket`, `delivery-slot`

Capabilities: checkout order-management

Events: ShippingDetailsCaptured

Interactions:

#	Interaction	Type	Input	Output	Event
1	Enter Delivery Address	🟦 input	`basket`	`basket`	—
2	Confirm Delivery Option	✅ confirm	`basket`	`basket`	`ShippingDetailsCaptured`

⚙️ Step 3 — Complete Online Payment¶

Customer submits payment details online; the system authorises payment, creates the order, and confirms the purchase.

Direction	Business Objects
Input	`basket`, `payment`, `customer`
Output	`order`, `payment`

Capabilities: checkout payment-processing order-management

Events: OrderPlaced

Interactions:

#	Interaction	Type	Input	Output	Event
1	Review Order Total	👁️ review	`basket`	`order`	—
2	Submit Payment	⚙️ execute	`basket`	`order`	`OrderPlaced`

👁️ Step 4 — Receive Order Confirmation¶

Customer receives an order confirmation screen or message with the order number, payment result, and fulfilment summary.

Direction	Business Objects
Input	`order`
Output	`order`

Capabilities: order-management

Events: OrderConfirmed

Interactions:

#	Interaction	Type	Input	Output	Event
1	Open Order Confirmation	🔔 notify	`order`	`order`	`OrderConfirmed` ←
2	Review Confirmation Details	✅ confirm	`order`	`order`	`OrderConfirmed`

Process: Process Catalog
Experience Index: All Operational Experiences

EXP-CHECKOUT — Checkout Operational Experience — UC-BoK v0.9-alpha

Checkout — Operational Experience¶

Journeys¶

End-to-End Sequence¶

Checkout — Cashier Journey¶

⚙️ Step 1 — Scan Items¶

⚙️ Step 2 — Apply Promotions¶

⚙️ Step 3 — Capture Payment¶

📢 Step 4 — Print Checkout Receipt¶

Checkout — Online Customer Journey¶

👁️ Step 1 — Review Basket¶

📥 Step 2 — Enter Shipping Details¶

⚙️ Step 3 — Complete Online Payment¶

👁️ Step 4 — Receive Order Confirmation¶

Related¶