RefundPercentageMissing
Example
{
	"code": "RefundPercentageMissing",
	"target": "Unknown",
	"details": [
		{
			"code": "RefundPercentageMissing",
			"number": 709,
			"message": "Refund percentage is required for 'Percentage' refund type.",
			"description": "For 'Percentage' refund type, you must specify refund percentage value.",
			"faultCode": "Client",
			"helpLink": "http://developer.avalara.com/avatax/errors/RefundPercentageMissing",
			"severity": "Error"
		}
	]
}
Explanation

This indicates that you specified a refund type of percentage, but did not specify the percentage. Please check your API call and provide a percentage.