|
1. Fuel delivery system
1.1 The system should provide an unattended fuel delivery service where a specified amount of fuel is delivered to customers. The cost is deducted from the customer's credit card account.
1.2 The sequence of actions to dispense fuel should be:
- The customer selects the type of fuel to be delivered.
- The customer inputs either a cash limit or a maximum amount of fuel to be delivered.
- The customer validates the transaction by providing credit card account details.
Rationale: The amount of fuel allowed depends on the credit limit but customers may wish to 'fill up' rather than have a specified amount of fuel. By specifying a maximum, the system can check if credit is available. Note the definition does not set out how credit card details should be provided.
- The pump is activated and fuel is delivered, under customer control.
- The transaction is terminated either when the pump nozzle is returned to its holster for 15 seconds or when the customer's fuel or cash limit is reached.
Rationale: Termination should not be immediate when the nozzle is returned as the customer may wish to restart the transaction e.g. to fill a fuel can as well as the car fuel tank. If a pump display is available, it may be appropriate to issue a 'Please wait for your receipt' message.
- A receipt is printed for the customer.
- The fuel stock is updated.
Specification: PUMP_SYS/FS. Section 1
|