Prioritize network connectivity, WMS/ERP integration, SLA guarantees for order accuracy and lead times, scalable labor and storage capacity, value‑add capabilities (kitting, returns), and clear pricing models. Verify carrier contracts and peak‑season performance data to ensure the provider can meet omnichannel delivery expectations.

Storage and labor form the base cost; picking complexity and shipment density drive per‑order fees, while transport rates depend on lane distance and carrier service. Optimize by consolidating SKUs, improving slotting to reduce travel time, negotiating bundled services, and leveraging regional hubs to shorten transit lanes.

Evaluate parcel and LTL carrier frequency, line‑haul schedules, and last‑mile partners serving your customer footprint. Transit windows depend on daily cutoffs, intermodal handoffs, and proximity to major expressways or rail terminals. Confirm transit time matrices for priority and economy lanes.

Require API access for order, inventory, and shipment feeds; review WMS functionality for real‑time inventory, lot/serial control, and EDI support; request sample reports and dashboard access for KPIs (OTD, accuracy, dwell time). Confirm data security, backup routines, and SLA on integration timelines.