When a video is auto-posted, Scaled Creator watches for people who comment your chosen keyword on that post. When someone comments the keyword, your product link is automatically DM'd to that person, so the right link reaches exactly the people asking for it.
Two videos can share the same keyword and each person still only receives the links attached to the specific video they commented on.
You do not have to send anything manually. The automation handles delivering the product link to engaged commenters.
Your links already have your Amazon Associate ID embedded in them, as long as you have connected an Amazon ID, so you earn commission from Amazon on qualifying purchases.