FedEx error code 6647, ShippingChargesPayment - Payor country code must match either Origin or Destination country code can occur if your FedEx account billing details do not match your Shipping Address in Shiptheory. Make sure the shipping address country is correct.
Additionally, when generating FedEx API Credentials at the Developer Resource Center (www.fedex.com), you will be prompted to "Select a Standard Test Key (US and Global) or Select a Special Intra Country test key". You must choose the appropriate country from the drop-down list that matches your Shiptheory Shipping Address. For example, if you hold a UK FedEx account, and Shiptheory has your shipping address as the UK, you must select United Kingdom when creating your FedEx API Credentials.
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