Hi @shahidamin,
FedEx One Rate service is available in the PRO version of the FedEx Live Rates plugin.
For more details, please visit FedEx WooCommerce Live Rates PRO page.
Due to the fact that this forum is dedicated to the free version of the plugin, if you have additional questions about PRO plugin features, please ask us directly here: , we’ll be happy to answer.
Best regards,
Tomek