Checkout¶

operational commerce

A basket can be converted into a confirmed order by applying promotions, totals and payment authorisation.

Converts a confirmed basket into a placed order by orchestrating totals calculation, promotion application, fulfilment option selection, payment authorisation, and order creation. Represents the critical transaction boundary in the commerce flow; checkout outcome is an authorised payment and a confirmed order record.

Overview¶


ID	`checkout`
Domain	commerce
Classification	`operational`
Actors	`customer`, `store-associate`, `system`
Services	4
Events	4
Processes	5
Applications	3

Services¶

ID	Name	Description
`checkout-basket`	Checkout Basket	Marks the basket as checked out and initiates the checkout flow, locking the basket from further modification.
`calculate-totals`	Calculate Totals	Computes the final order totals including subtotal, promotions, taxes, shipping, and voucher deductions.
`apply-promotions`	Apply Promotions	Applies all eligible promotions to a basket and returns the updated basket with discounts itemised by promotion.
`authorize-payment`	Authorize Payment	Requests payment authorisation from the PSP for the specified amount and payment instrument, returning an authorisation code.

Events Emitted¶

Event	Subject	Description
`basket-checked-out`	``	The customer initiated the checkout flow from the basket.
`basket-checkout-started`	``	Checkout was started; the basket moved into the checkout processing state.
`checkout-started`	``	A basket has entered the checkout process; payment and delivery details are being collected.
`checkout-cancelled`	``	An in-progress checkout was abandoned or explicitly cancelled before payment completion.

Processes¶

Process	Name	Classification
`checkout`	Checkout	transactional
`voucher-redemption`	Voucher Redemption	transactional
`self-checkout`	Self-Checkout	transactional
`scan-and-go`	Scan and Go	transactional
`loss-prevention-case-handling`	Loss Prevention Case Handling	management

Applications¶

Application	Name	Tier
`pos`	POS
`ecommerce-platform`	eCommerce Platform
`associate-workspace`	Associate Workspace

Metrics & KPIs¶

Metric	Alias	Unit	Direction
Gross Merchandise Value	GMV	currency	↑
Average Order Value	AOV	currency	↑
Conversion Rate	CR	percentage	↑
Cart Abandonment Rate	CAR	percentage	↓

Touchpoints¶

Touchpoint	Type
💻 Web Store	Digital
💻 Mobile App	Digital
🏪 Physical Store	Physical
🏪 Self-Service Kiosk	Physical
🏪 Clienteling Tablet	Physical
💻 Partner / B2B API	Digital
🏪 Associate Mobile Workspace	Physical
🏪 SoftPOS Device	Physical

Validation Rules¶

Rule	Type	Applies To	Severity
`checkout-requires-active-basket`	`pre-condition`	`checkout`	invariant
`checkout-requires-active-product`	`pre-condition`	`checkout`	invariant
`voucher-redemption-requires-valid-voucher`	`pre-condition`	`voucher-redemption`	invariant
`self-checkout-requires-active-terminal`	`pre-condition`	`self-checkout`	invariant
`loss-prevention-intervention-requires-policy`	`pre-condition`	`loss-prevention-case-handling`	invariant
`checkout-creates-order`	`post-condition`	`checkout`	invariant
`checkout-clears-basket`	`post-condition`	`checkout`	invariant
`authorize-payment-sets-authorized`	`post-condition`	`authorize-payment`	invariant