question

I've issue with refund API on sanbox platform. Its returning message "Could not refund transaction: TOKEN FAILURE"

Also there is no refund menu on the merchant dashboard. Is there anything need to be setup to allow refund?

Thanks

{
	"message": "400 Bad Request"
	"error":{
		"code": "processing_error"
		"message": "Could not refund transaction: TOKEN FAILURE"
	}
}