XML Output Filter
Add a filter to the XML export feature for XML output.
We are using the Woocommerce/Shipstation plugin to connect through Shipstation to our fulfillment center. They handle the shipping and print the packing slips. The data they get from Shipstation doesn't include the custom fields, so they don't see the field we are currently mapping the input to. They can see a Shipstation field field for Gift Order and for a gift message, so I just want to make our field map over their field.