From the definition of affiliate links:
Links to external services and vendors that include a unique identifier within the link destination to tie the link to your account.

I'm not sure if what I'm trying to do falls in that definition?? Both my sites are wordpress sites. My wordpress.org site will offer customers to buy my creations (cards) or buy materials to make their own cards. It does have an element of buying something that I made but instead of directing them to my etsy site its to my own store site. With the addition of other products not made by myself.

Thanks for your clarification!