We often have customers that want to use their own UPS/FedEx accounts to handle their shipments (to get their negotiated rates). Without getting rid of our calculated rates for those who want their items shipped 'normally', how can we add the option during checkout to allow other customers to use their own accounts?
Absolutely! As I have mentioned above, you can use the Ship, Rate & Track app for FedEx to handle this easily. You can set the shipment payer type as "Third Party" and add your customers' account number and other details (optional).
This app is specifically for handling FedEx shipping. However, we have another app; Multi Carrier Shipping Label that helps you add third party shipping account for both FedEx & UPS (currently not available for DHL). You can try the app with a 14-day free trial and contact our support for any assistance required.