Locking Facility for Cart from front end for learner side

From the front end if another learner tries to purchase the same event at the same time as follows:

1. Click on Add to cart
2. After entering all the details, click on Checkout.
3. On this page, the learner can add the credit card details and click on Pay to make the payment.
4. Else, if that seat is already taken by another participant, then a message as follows will be shown.
5.  If the locking period is over, and if the learner is still in the payment gateway, the learner would still be able to make payment through the payment gateway is a third-party entity.
6. A credit note will be generated in this case.
7. If the auto refund is enabled by the admin from the Training Management Settings, the auto refund would be provided to the learner who uses a Stripe account. In other gateways like Razorpay and Paypal, the refund needs to be done manually.
8. Once the refund is completed, the credit note will be marked as “Refund Process Completed”. 
9. If the auto refund is disabled by the admin, only the credit note will be generated and the refund needs to be done manually.