If the chosen method is either cash or Gift/Loyalty card then the amount verification is done to ensure the balance is greater or equal to amount. Once the payment state is reached, the system will wait for customer's selection. 11 is an extension of payment method rom Checkout process. The payment can also be made by combination of either two from the three methods provided. If the tap on the card is not activated, it requires the customer to insert card and enter secure pin to complete payment. The card will be blocked if the wrong pins are entered three times and tap will not be applicable if the amount of purchase is greater than $100.On the other hand, payment by cash or Loyalty or card requires balance to be greater than or equal to the amount purchased. Payment by credit/debit either requires tap or four digits secured pin. Happy paths are highlighted in the bounding box. The sequence diagram shows all three options and possible alternatives.
There are three possible options either by cash, credit/debit or Gift/Loyalty card. 9 and 10 is the expansion of method of payment chosen by a customer during checkout.
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