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I need to create a customized extension to install on my open cart.
This extension will have a start a countdown on the product once the customer add a product to cart.
There will be a 15 mins time limit for each customers to hold on the product in their cart.
During this 15 mins, the product will display a stock status as "unavailable" if stock is qty is zero .
After the 15 mins, the product will then be removed from the customer's cart and add back to the stock qty.
Admin should be able to adjust the time limit via backend system.