Everflow deep linking works by hanging a destination URL off your tracking link as a url= parameter. The catch is that the destination is itself a URL, full of the same ? and & characters that separate parameters. Left raw, Everflow reads them as parameters on its own link, and everything after the first & is torn off before the storefront ever sees it. The click still tracks; the campaign attribution silently disappears.

So the destination is assembled first, in full, and then percent-encoded as one single string. : becomes %3A, / becomes %2F, ? becomes %3F and & becomes %26. Everflow decodes it once on the redirect and hands the storefront the URL you actually meant.

The order matters. Product URL, then the tracking parameters appended with ? or & depending on whether the product URL already has a query string, then encode the whole thing, then attach it to your tracking link:

https://desktronic.lt/products/homeone?variant=41025709047946
  + &tw_source=affiliates&tw_campaign=Test
  → encodeURIComponent(…)
  → https://www.xjcs5z7m.com/28KL6/3QQG7?url=https%3A%2F%2F…

Your tw_source, tw_campaign and coupon are read out of the tracking link you paste and moved into the encoded destination. They have to move: a deep link overrides the offer's default destination entirely, so anything left sitting on the tracking link's own query string never reaches the storefront. That is also why you cannot edit them here — they are yours, and moving them is automatic.

And an empty coupon is worse than no coupon. The storefront's coupon script reads coupon= with a blank value as an instruction to clear whatever coupon is already on the cart, so this tool omits the parameter entirely when there is no coupon rather than passing it empty.