1100 / 1110 Messages – Pre-Authorisations

The 1100 / 1110 message pair is used for pre-authorisation purposes, e.g. seeking approval for the delivery of goods or services where the final amount is not known at the time of the transaction. This is typically the case in hotel, ecommerce and unattended environments (for example petrol stations). The approval is mandatory to get access to the required goods or service or to validate in advance the payment means (credit card) - including the available funds that will be used by the customer at the time of purchase/sale.

Pre-authorisations and authorisations do not result in the cardholder being debited immediately. The cardholder will be debited when this transaction is cleared to the card schemes.

The transaction card details can be provided by a terminal's magnetic stripe reader, ICC reader or manually via the keyboard.

For a magnetic stripe or ICC read the Track 2 Data (Field 35) is used for authorisation, whereas for a manual entry the Primary Account Number (Field 2) and the Date of Expiration (Field 14) are used.

Field	Field Name	Required	Comments
	Message Type ID	Mandatory	1100
	Primary bitmap	Mandatory
2	PAN	Conditional	Primary Account Number. Required for keyed transactions where Field 35 is not available.
3	Processing code	Mandatory	See Field 3 description for valid values.
4	Transaction amount	Mandatory	The amount will be in the currency specified in Field 49.
6	Cardholder Billing Amount	Conditional	Must be included if DCC has been performed on the device. The amount will be in the currency specified in Field 51.
10	Conversion Rate	Conditional	Mandatory if Field 6 is present.
11	STAN	Mandatory	Unique reference number from the transaction initiator.
12	Transaction Local Date and Time	Mandatory	Date and time at terminal.
14	Expiration Date	Conditional	The date upon which the card expires. Present only if Field 35 (Track 2) is not provided. Keyed transactions only.
22	Point of Service Data	Mandatory	See Field 22 description for details.
28	Reconciliation Date	Mandatory	See Field 28 description for details.
29	Reconciliation Number	Mandatory	See Field 29 description for details.
32	Acquiring Institution ID	Mandatory	Provided by Elavon.
35	Track 2 Data	Conditional	This field shall be supplied if a magnetic stripe card is swiped through the POS reader or an ICC card is read through an ICC device reader. If this field is present Fields 2 and 14 should not be provided
37	Retrieval Reference Number	Mandatory	Unique partner transaction reference.
38	Approval Code	Conditional	Mandatory for completions and incremental pre-authorisations where approval code from (initial) pre-authorisation is populated.
41	Terminal Identification	Mandatory	Card Acceptor Terminal ID. The 8 digit terminal ID will be assigned and provided by Elavon.
42	Merchant ID	Mandatory	A unique ID for the establishment requesting the authorisation.
43	Card Acceptor Name/Address	Optional	Name/Address of establishment requesting the transaction.
48	Additional Private Data	Mandatory	Please refer to Field description and Appendix B.
49	Transaction Currency Code	Mandatory	ISO 4217 numeric currency code of the amount in Field 4.
51	Cardholder Billing Currency Code	Conditional	Required if Field 6 is present. ISO 4217 numeric currency code of the cardholder billing amount specified in Field 6.
52	PIN Data	Conditional	Encrypted PIN.
53	Security Related Information	Conditional	This field is mandatory when PIN data is present, except where DUKPT information is supplied in Field 63, Tag 01.
54	Amount, Other	Conditional	Must be included if there is a cash component of the overall transaction amount in Field 4. The amount will be in the currency specified in Field 49.
55	Integrated Circuit Card Data	Conditional	Must be supplied when the ICC has been used to process the transaction.
60	Reserved Private Data	Mandatory	If a partner supports DCC, Tag 01 (bytes 3 – 4) determine the number of supported currencies. Elavon will advise the partner of the appropriate values in Tag 01.
61	Reserved Private Data II	Conditional	Refer to Field Descriptions for available Tags.
63	Reserved Private Data III	Conditional	Tag 01 is mandatory if PIN Data is present and the DUKPT scheme is being used.
64	MAC	Conditional	Value calculated as described in Appendix B if MAC processing is supported.

Field	Field Name	Required	Comments
	Message Type ID	Mandatory	1110 for Pre-authorisation / Update / Completion & Authorisation response.
	Primary bitmap	Mandatory
2	PAN	Conditional	Echo if present in corresponding 1100.
3	Processing code	Mandatory	Echo value in corresponding 1100.
4	Transaction amount	Mandatory	Echo value in corresponding 1100 or partially approved amount.
6	Cardholder Billing amount	Conditional	Echo if present in corresponding 1100.
10	Conversion Rate	Conditional	Echo if present in corresponding 1100.
11	STAN	Mandatory	Echo value in corresponding 1100.
12	Transaction Local Date and Time	Mandatory	Echo value in corresponding 1100.
28	Reconciliation Date	Mandatory	Echo value in corresponding 1100.
29	Reconciliation Number	Mandatory	Echo value in corresponding 1100.
32	Acquiring Institution ID	Mandatory	Echo value in corresponding 1100.
37	Retrieval Reference No.	Mandatory	Echo value in corresponding 1100.
38	Approval Code	Conditional	Returned for approved and format error responses. See Field 38 description for more details
39	Response Code	Mandatory	Response from the authorisation.
41	Terminal Identification	Mandatory	Echo value in corresponding 1100.
42	Merchant ID	Mandatory	Echo value in corresponding 1100.
43	Card Acceptor Name / Address	Conditional	Echo value if present in corresponding 1100.
48	Additional Private Data	Mandatory
49	Transaction Currency Code	Mandatory	Echo value in corresponding 1100.
51	Cardholder Billing Currency Code	Conditional	Echo if present in corresponding 1100.
54	Amount, Other	Conditional	Original amount requested in a partial approval.
55	Integrated Circuit Card Data	Conditional	Returned for an ICC Transaction. Full details in Field 55 Description section.
63	Reserved Private Data III	Conditional	Only those tags relevant to response messages will be returned.
64	MAC	Conditional	Value calculated as described in Appendix B if MAC processing is supported.