About GSO
Golden State Overnight (GSO) offers Priority Overnight Delivery to every address in California and select regions of Western Nevada and Arizona.
GSO Tracking number Instructions:
Auto-Track GSO Shipments
Our Multi-Carrier Tracking API will auto-track your GSO shipments
GSO Post-Shipping Automation
Fully integrate GSO tracking into your WooCommerce or Shopify store admin
GSO Delivery Notifications
Send your customers automated GSO shipment status & delivery emails or SMS
GSO Tracking on Your Store
Direct your customers to track GSO shipments on a tracking page on your store