Case Study
The most reliable way to drive external traffic that actually helps your Amazon business is to stop pointing ads at the listing. Send Meta traffic to your own store, with an offer that is not available on Amazon, and let the demand you create show up as people searching for you on Amazon later.
Attribution links tell you what happened after the fact. They do not tell Meta anything. Amazon never passes click-level conversion data back, so the algorithm cannot optimize toward buyers no matter how you tag the link. A rebate on a campaign that cannot be optimized is still a campaign that cannot be optimized. Where Attribution earns its keep is on traffic you are not paying for, like an email blast to your own list during a sale.
What about sending traffic straight to the listing? That is the default most brands try, and it is the one that does not work. Meta never learns who converted, so it never gets better.
Which platform first? Meta is the workhorse for most physical products because of its targeting and retargeting.