If you're automating Amazon orders and keep getting "new sign-in detected" emails, that's not a false alarm — it's Amazon telling you your session hygiene is broken, and it's exactly the pattern that leads to a locked account.
Amazon doesn't just check your password. It fingerprints the session: IP address, browser fingerprint, cookie continuity, and how long it's been since your last authenticated action. Re-logging in from scratch on every order — especially from a datacenter IP that changes between runs — looks identical to a stranger repeatedly trying your credentials from different locations.
The reliable pattern is: authenticate once, save the full cookie/session state, and reuse that session for every subsequent order until it actually expires — rather than treating each order as an independent login. Paired with a stable IP per account (so the account isn't seen jumping across networks) and TOTP-based two-factor instead of SMS/email OTP (which breaks unattended automation entirely), this removes almost all of the new-device friction.
This is the exact problem Synked's Amazon session model was built around: one persistent, cookie-backed session per connected account, with a sticky IP, so an order run looks like the same returning shopper every time instead of a new one.
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