OpenCart Community

Wondering if anyone can help me. I am about to run a promotion across 10 items on my site and basically the customer will be a voucher from another site and i want there to be a link to a landing page that has those items on them. I want them to be able to insert there voucher code somewhere(which is unique to each person) and recieve the discount. Any ideas?

In a way this could be adding those products to a password protected page which will just allow that customer base to use. How do i do this?

2 options any help?

Could you not just create a category with the 10 items in and hide it from normal category list then link to that page and then customer can add the product to cart and input the discount code.