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Terminal protocol GPE Refund Connector

[ | version 3.1]


The connector is forbidden for use by the platform background agent.

Connector processing type: Row by row!

The connector that helps connect external cash register systems (ECR) and a payment terminal when processing refunds from a merchant's account to a cardholder's account. The connector can convert requests from cash register systems entered in a user-friendly format (e.g., CZK 100) into a format the payment terminal understands. Subsequently, it can transform the transaction processing results returned by the terminal into a format comprehensible to the POS system.

Transfer of an amount from the account of the merchant to the cardholder’s account. This transaction is very risky for fraud, so please handle it carefully.


POS Connection

IP Address

Destination IP address of terminal (e.g.

IP Port

Destination port of terminal (e.g. 2050)

Input & Output Schema


Pos GPE Refund Input Schema (ver. 1.1.0)

Column Data type Allow null Description
Amount Double No Transaction amount defines the value of a transaction. The amount is given without decimal point. Example: the amount "2000" is given for the amount 2000 HUF or 20,00 CZK
Currency String Yes Currency of a transaction. It is important for transaction receipt, but currency has no impact on the Totals where in FID L is clear total of all transaction amounts. If this field is not included in the message, the terminal will use its default currency. Format: numeric Length: fix 3 Example of supported codes: 203 = CZK, 978 = EUR, 840 = USD, 826 = GBP
CustomerLanguage String Yes Customer language code (ISO639-1) sent by ECR. Example: cs, en, de, fr, sk etc.
ClientId Integer Yes Field allows adding additional information related to the transaction, which is then used to check the transaction via non-cash payment.
MultiIdAccountNumber String Yes The field contains a Multi ID account number
ReferenceNumber String Yes Alphanumeric information sent by ECR to identify each transaction by adding an identifier. This identifier appears in transaction reports. Warning: Invoice number and Reference number cannot be used together.
IpAddress String Yes Destination IP address of terminal
IpPort Integer Yes Destination port of terminal


Pos GPE Refund Output Schema (ver. 1.0.0)

Column Data type Allow null Description
TerminalId String Yes Terminal logical identifier on which the transaction will be made
TransactionTimestamp DateTime No Date and Time of transaction. The value is formatted: YYMMDDHHmmSS, where YY – year (last 2 numbers for 2017 only 17 is given) (00 to 99), MM = month (00 to 12), DD = day (01 to 31), HH = hour (00 to 23), mm = minute (00 to 59), SS = second (00 to 59)
CardExpirationDate String Yes Expiration date of a payment card in the month and year form. Example: 1017 for a card expiring in October 2017
AuthorizationCode String Yes Identification of completed non-cash financial transactions. It is used to identify the transaction when a claim for refund is made
PrimaryAccountNumber String Yes This number must be masked for security reasons. Example: "472925**135" (len=15), "472925*135" (len=16), "472925*328135" (len=19)
IsTransactionApproved Bool No Flag identifies that the transaction has been approved
ResponseCode String Yes This field informs about processing results (of transaction or message). Defined codes are in the chapter Transaction response codes below
CardType String Yes Indication of used card scheme product. Example: Visa, Mastercard, etc.
ApplicationId String Yes The field contains information of chip application ID with leading information. The value of AID is set by card associations. Examples: "A0000000031010" or "A0000000043060"
CodePage String Yes Info for printing reasons. This field is defined for future use if information is available
TransactionId String Yes Numeric unique identifier of the financial transaction.
AdditionalInformation String Yes The field contains additional text with information about response
PrintingText String Yes The field contains preformatted text for the printing of the transaction receipt by the ECR. The text is formatted into lines. The line contains formatting characters and/or constant value or directive.
Transaction response codes

Codes of accepted transactions

Code Description
000 - 009 Accepted
010 Accepted, Partial amount approved

Codes of rejected transactions

Code Description Code Description
050 General processing error 082 Reversal successful. Reversal reason = Card removed too soon
051 Unable to connect with Central Systems 100 Transaction not supported or not allowed
053 A response from the Central System was not delivered 101 Invalid card
055 Declined by chip card without authorization 103 Error in message format (protocol error)
056 Declined by authorization host (online transaction) 106 Error in message CRC (protocol error)
060 Transaction was canceled by the operator 107 Error in MAC (protocol error)
061 Transaction was canceled by the customer 108 Terminal Busy (protocol error)
062 Customer rejected transaction due to amount 110 The amount is not allowed
063 Processing exceeded the designated time limit 160 Totals on ECR, POST are not equal, on AC completed (AC+POST)
070 Transaction was not cancelled 161 161 Totals on ECR, POST are not equal, on AC not finished (POST without Response)
071 Currency not supported (Multicurrency) 200 Mandatory field missing in request message
080 No paper in the internal printer 360 Repeat Last Message – origin message not found
081 Reversal successful 500 Internal application Error

Release notes


  • Extended input scheme for IpAddress and IpPort


  • First release