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Checkout

customer action transactional

Outcome

A confirmed order is created with payment authorised, promotions applied and loyalty benefits calculated.

Service Flow

flowchart LR
    S0["Create Basket"]
    S1["Calculate Basket"]
    S0 --> S1
    S2["Evaluate Promotions"]
    S1 --> S2
    S3["Calculate Benefits"]
    S2 --> S3
    S4["Authorize Payment"]
    S3 --> S4
    S5["Create Order"]
    S4 --> S5

Capabilities

Basket Management Checkout Promotions Loyalty Payment Processing Order Management

Domains

customer commerce pricing promotion loyalty payment order

Business Objects

Object Classification Domain
customer aggregate-root customer
basket aggregate-root commerce
promotion aggregate-root promotion
payment aggregate-root payment
order aggregate-root order

Business Services

  • create-basket
  • calculate-basket
  • evaluate-promotions
  • calculate-benefits
  • authorize-payment
  • create-order

Applications

Application Classification
POS pos system-of-engagement
eCommerce Platform ecommerce-platform system-of-engagement
Promotion Engine promotion-engine system-of-intelligence
Payment Hub payment-hub platform
OMS oms system-of-record
Event Classification Object Terminal
BasketCreated created basket —
BasketUpdated updated basket —
BasketCalculated calculated basket —
BasketCheckedOut transitioned basket ✓
BasketCheckoutStarted transitioned basket —
BasketConverted transitioned basket ✓
BasketAbandoned transitioned basket ✓
BasketMerged transitioned basket ✓
OrderCreated created order —
OrderValidated transitioned order —
OrderConfirmed transitioned order —
OrderModified updated order —
OrderCancelled transitioned order ✓
OrderClosed transitioned order ✓
PromotionApplied transitioned promotion —
PromotionEvaluated calculated promotion —
CouponValidated calculated coupon —
CouponRedeemed transitioned coupon ✓
LoyaltyMemberEnrolled created loyalty-member —
LoyaltyPointsCalculated calculated loyalty-account —
LoyaltyPointsIssued transitioned loyalty-account —
LoyaltyPointsRedeemed transitioned loyalty-account —
LoyaltyBenefitsCalculated calculated loyalty-account —
PaymentAuthorized transitioned payment —
PaymentCaptured transitioned payment —
PaymentVoided transitioned payment ✓
PaymentRefunded transitioned payment —
PaymentSettled transitioned payment ✓
PointsIssued updated loyalty-account —
PointsRedeemed updated loyalty-account —
CustomerCommunicationSent created customer —
LoyaltyCardActivated created loyalty-member —
LoyaltyPointsAccrued updated loyalty-member —
GiftCardActivated transitioned gift-card —
GiftCardRedeemed updated gift-card —
GiftCardToppedUp updated gift-card —
GiftCardExpired transitioned gift-card —
GiftCardCancelled transitioned gift-card —
GiftCardRefunded transitioned gift-card —
RefundProcessed updated refund —
RefundFailed transitioned refund —
RefundConvertedToCredit transitioned refund —
CheckoutStarted transitioned basket —
CheckoutCancelled transitioned basket —
BasketLineAdded created basket-line —
LoyaltyPointsEarned updated loyalty-account —
Endpoint Method Service Description
/orders POST create-order Creates a new Order from a validated Basket, transition…
/orders/{id} GET track-order Retrieves the full state of an Order including lines, p…
/orders/{id}/cancel POST cancel-order Cancels a confirmed Order, triggering reversal of payme…
/orders/{id}/confirm POST confirm-order Confirms a validated Order once payment is authorised, …
/payments/authorizations POST authorize-payment Submits a payment authorisation request for the order t…
/payments/authorizations/{id}/capture POST capture-payment Captures a previously authorised Payment. Requires paym…
/payments/authorizations/{id}/void POST void-payment Voids a payment authorisation that has not yet been cap…
/payments/{id}/refunds POST refund-payment Initiates a full or partial refund against a captured p…
/loyalty/members POST enroll-member Enrolls a Customer in the loyalty programme, creating a…
/loyalty/accounts/{id}/points POST issue-points Issues loyalty points to a member's account based on a …
/loyalty/accounts/{id}/redemptions POST redeem-points Redeems loyalty points against a basket during checkout…
/promotions/evaluate POST evaluate-promotions Evaluates all applicable promotions against a basket, a…
/transactions POST checkout-basket Opens a new POS transaction, initialising the basket fo…
/transactions/{id}/payment POST authorize-payment Adds a payment tender to an in-progress POS transaction…
/transactions/{id}/void POST cancel-order Voids an in-progress POS transaction before payment com…
/baskets POST create-basket Creates a new digital basket for an anonymous or authen…
/baskets/{id}/lines POST add-basket-item Adds a product line to an existing basket, validating a…
/baskets/{id}/checkout POST checkout-basket Converts a validated basket into an order, triggering p…
/members/{id}/earn POST issue-points Awards loyalty points to a member account based on a co…
/members/{id}/redeem POST redeem-points Redeems loyalty points as a payment tender during check…
/members/{id}/balance GET calculate-points Returns current points balance, tier status, and next t…

Validation Rules

Rule Type Severity Condition
checkout-requires-active-basket pre-condition invariant basket.lifecycle = active AND basket.count(basket-line)…
checkout-requires-active-product pre-condition invariant product.lifecycle = active for each basket-line
checkout-creates-order post-condition invariant order.lifecycle = confirmed AND order.count(order-line)…
checkout-clears-basket post-condition invariant basket.lifecycle = checked-out

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