I am required to send the cancellation request to Shipwire. As per the documentation I am using Fulfillment order cancellation_request API method. I am getting this response.
What is required to make it work.
"The fulfillment service has not registered for fulfillment order based fulfillments."
Set a callback_url and the fulfillment_orders_opt_in flag to true on the FulfillmentService. Good luck.
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