Refund a transaction from the POS

Class

Name	Description
`MerchantPos`	Extends `AdyenPos`. Class used to implement all payment platform functionality. Implements all functions that do not involve the PED.

Method

Name Description

cancelOrRefundAtPsp

Start a cancel or refund. If a pspReference has been generated, pass this as a reference for the transaction. Otherwise, provide the tenderReference.

This method returns an immediate response of type LibraryResult. Check if this result is "OK", before continuing the operation. If the LibraryResult value is not "OK", the system will not return the related callback with the asynchronous result. See here for more on extracting data from an event or callback.

Tender Parameter

Name	Type	Required	Description
`tender`	Tender		Represents the tender.

Attributes

Name	Type	Definition
`merchantAccount`	String	The `merchantAccount` account to receive the money.
`merchantReference`	String	The transaction reference provided by the Merchant (reported in the Adyen payments platform).
`pspReference`	String	The reference provided by the Adyen PSP (reported in the Adyen payments platform). Use the PSP reference to identify the transaction to be cancelled.
`tenderReference`	String	Tender reference provided by the library if there is no connection to the PSP. Use the Tender reference to identify the transaction to be cancelled.
`terminalId`	String	The PED to process the transaction on.

Callback

Name	Description
`cancelOrRefundAtPspCallback`	Returns the result of creating the tender

Callback Response Attributes

Name	Description
`additionalData`	Adyen returns the `additionalData` object, a generic container that can hold extra response fields
`tenderReference`	Reference the PED provides for the transaction, used in reporting on the Adyen payments platform.
`tenderState`	Transaction state
`adyenResult`	Transaction result details

Determine the current and final tender state

Adyen provides a method to determine the current, or final, tender state. For more information, see Determine the current and final tender state - JNI.