Do not combine mode=auto with explicit tier parameters like premium_proxy or stealth_proxy; the API rejects the combination with a 400. Either let the API auto-select the tier or name one tier explicitly, not both. Also know that passing wait_for turns JavaScript rendering on even if you did not ask for it, which changes the cost and behavior of the request. If you need infinite scroll pagination through a scenario, use the standard premium or datacenter proxies: stealth_proxy is incompatible with infinite_scroll. Read a failed request's error body for the parameter name; most 400s are one of these conflicts.

Context: Web (proxlane integrations doc): documents parameter conflicts that return 400s: mode=auto cannot be combined with explicit proxy-tier parameters, and wait_for quietly forces render_js on. Stealth proxies are incompatible with infinite_scroll.