Search api?

Shopify Partner
7 0 0
I'd love to get access to the search api to use in my app. I haven't seen anything related to search in the api. However, i know there is access to Products && collections. As i type this, i wonder... I don't think i'd be able to access a certain's shop that has installed my api to have their products "pulled' by a keyword entered by a user on my site, would they? NO, i can't because the products are based on the ID. so i'd still have to pull all the ID's to my shop anyways... more then i should have on my site. is there anyway to only show a link to a user who comes from my site? maybe in an iframe? i don't know i'm thinking aloud now and it's late :-). any help?