External Link to cart redirection.

[tariq_89]

Dears,
I developed a shop with VirtueMart (example: www.myshop.com), and I'm listing some of the shop products on other website (example: www.myexternalwebsite.com) with a click-to-buy button. What I want is to enable the visitors of (www.myexternalwebsite.com) who want to buy the product, to go directly to the cart of the shop (www.myshop.com) with the chosen product already added to the cart, to proceed with the payment on the shop (www.myshop.com) and then to go back to the external website (www.myexternalwebsite.com) after the purchase is complete with success/fail message.
I want just ideas and headlines, of course I don't need it developed

And thank you in advance.