Promotion Transaction Flow

The steps for promotional cart calculation are outlined below:

Promotional Cart Calculation Process:

During the process of adding and removing items from the cart, applicable promotions in the cart are checked using the "calculate" method. As a result of this process, the discount amounts arising from promotions are calculated, and the final total amount of the cart is determined.

Before Payment:

When cart operations are completed and it transitions to the payment stage, the finalized cart information along with the details of promotions in this cart is used to call the "startTransaction" method.

Commitment Process Upon Successful Payment:

If the customer's payment is successfully completed, this transaction is processed through the "commit" step. This confirms the use of the promotions specified in the "startTransaction" step and signifies the completion of the order due to the customer's successful payment.

Autocancel on Timeout:

A transaction initiated with the "startTransaction" step is automatically canceled by the system if it is not "committed" within a specified period (e.g., within 30-40 minutes). This indicates that the customer's payment time has expired, and the transaction has been canceled, thus indicating that the specified promotions could not be utilized. In cases of limited usage promotions, if the customer did not benefit from this promotion, the "autocancel" process allows the customer to avail of the same promotion in their next transaction.

This process flow ensures the accurate calculation of the shopping cart, successful processing of payment transactions, and proper application of promotions. Additionally, it informs customers that their transaction will be automatically canceled if they exceed a certain time limit, ensuring transparency and fairness in the use of promotions.