Could you please help me adding product to cart via an external link. i wan to add a product link on ad-words website so customer can click on the link and directly go to magento basket page.
What version of Magento are you on?
Since Magento 1.8, it's no longer possible to add a product to the cart via an external link.
It may be possible to achieve this with some custom development, please see this answer on the Magento Stack Exchange:
Any further questions, let me know
I think you can do via core php using iframe.
it is just an idea.
create a module and pass the $product object in the phtml file. after that create only "add to cart" like: