Method
How affiliate links work here
Amazon UK links are tagged amazon.co.uk URLs on the href — not a /go/ redirect. Other retailers hop via /go/:partner?u= which requires https, no credentials, and a host on that partner’s allowlist. Anything else is 400, never a redirect.
Awin tracking URLs (awin1.com) get the publisher id at the hop. John Lewis, Next, Boots, Argos, Very, Mamas & Papas and JoJo Maman Bébé remain direct-host partners until an Awin wrap replaces them.
Clicks may be written to Analytics Engine inside waitUntil. A telemetry failure cannot block the 302. IPs are hashed with a salt and a date, or not stored.
World Aid Network donate links are not affiliates. NHS, GOV.UK and Lullaby Trust links are not affiliates.