Prioritize WMS capabilities (real‑time inventory), throughput metrics (orders/hour), SLA definitions (pick, pack, ship), cold‑chain if needed, and clear billing for storage, handling and value‑added services. Validate peak‑season capacity and integration options with your storefronts or ERP to avoid latency during growth phases.

Confirm carrier frequency, consolidation services, real‑time tracking, and proof‑of‑delivery processes. Verify the 3PL’s carrier agreements, line‑haul options, cut‑off times, and contingency plans for disruptions. Review insurance coverage, claims handling and historic on‑time performance metrics.

Require WMS with API/EDI connectivity, batch and wave picking, kitting and labeling, returns processing, and transparent inventory visibility. Ensure the 3PL provides KPI dashboards, configurable SLAs, and scalable labor models to handle variable order profiles across retail, wholesale and direct‑to‑consumer channels.