Parameter	Type	Description
accessId*	String	Unique identifier that ensures that the integrator has the authorization to make requests on behalf of the customer. (Specifically, a customer's merchant account)

Parameter	Type	Description
token*	Object/Hash	Object containing authentication parameters - most crucially the requestId which is required with every call. For more information, see the Token Object.
paymentId	String	The payment ID of the payment being fully refunded or voided.
enableRemainingAmountRefunds	Boolean	This is used in the event that part of payment has already been refunded. If this is set to true, then the a refund will be issued for whatever is left in order to get the total amount refunded equal to the total amount of the payment. If set to false, then will respond with error message stating that the transaction has already been partially refunded.
refundNote	String	Notes will be stamped on refund and viewable on the in-app payment details page of the refund.
orderId	String	Values sent here will be stored in the Order Number field within ClientPay.
emailOptions	Object/Hash	Object containing various options for emailing a payment receipt. See the email options object for more details.