[OrderRefactor][Order][Checkout] Proceed to Payment - [Step1] Apply Promotion Code and Lock Product Stock

[nashtech-vietvuhoang1]

When the Checkout is fulfilled (ticket 1110):

• Payment method is added
• Shipment method is added
• Shipment address is specified
• Promotion Code is added (not required)
• Total checkout amount is specified includes: Checkout Total amount, Tax, Shipment amount, Shipment Tax, discount amount

Customer now can continue to proceed to payment.
In this Step, following actions will be done:

• Promotion code is actually applied, Checkout state will be PAYMENT_PROCESSING, progress attribute is PROMOTION_CODE_APPLIED
• Product stock (quantity) is locked in Inventory, Checkout state will be PAYMENT_PROCESSING, progress attribute is STOCK_LOCKED
• Create Checkout Payment object to process payment, Checkout state will be PAYMENT_PROCESSING, **progress ** field is PAYMENT_CREATED
  • Checkout attributes field will keep returned payment_id for further processing tracking

When any failure, error will be reported to last_error field (Error code and error message).

• if applying Promotion code failed, Checkout state will be PAYMENT_PROCESSING, progress attribute is PROMOTION_CODE_APPLYING_FAILED, user is required to re-enter promotion code.
• if any error of locking stock (Out Of Stock for example), Checkout state will be PAYMENT_PROCESSING, progress attribute is STOCK_LOCKING_FAILED, user is required to re-enter product quantity.
• if calling to Payment Service failure, rollback promocode and rollback stock will be executed

Note: Consider Retry execution

Checkout ERD

Checkout Lifecycle Diagram

Init Payment Flow