Cartthrob remove product from cart if purchased

Question

I'm new to cartthrob and want to know how can a product be automatically deleted if that product has been purchased from current logged in user. Let's see it as a scenario I'm logged out and I add that product into cart and while checkout I get asked to login and After I login that product gets added to cart even if I've already purchased that product to cart....so please tell me how can I remove that product automatically in Expressionengine cartthrob?

Answer 1

You'll need to create an extension on the cartthrob_add_to_cart_start hook. This hook runs right before the process of adding an item to the cart so you can check if the member has purchased said product and then apply the end_script value and stop execution to meet your needs