| Segment | Ebene | Beschreibung | Opt/Mand. |
|---|
| UNH | 0 | A service segment starting and uniquely identifying a message. The message type code for the Authorization message is AUTHOR. Note: Authorization messages conforming to this document must contain the following data in segment UNH, composite S009: Data element 0065 AUTHOR D A UN | Mandatory |
| BGM | 0 | A segment for unique identification of the Authorization message, its type and number and its function, i.e., specifying if it is an authorization or request for authorization. | Mandatory |
| DTM | 0 | A segment containing the creation date of the Authorization Message. | Optional |
| BUS | 0 | A segment providing information for routing of the message. | Optional |
| SG1 | 0 | SG1 | Optional |
| RFF | 1 | A segment referring to the message that has to be authorized or to a previously-sent request for authorization. | Mandatory |
| DTM | 1 | A segment indicating the date and time of creation of the message referenced in the RFF segment or possibly the payment date. | Optional |
| SG2 | 0 | SG2 | Optional |
| FII | 1 | A segment identifying the Ordered Bank acting for the Ordering Customer and/or Payor and the relevant account number and currency. | Mandatory |
| CTA | 1 | A segment identifying a person or department for the financial institution specified in the FII segment and to whom communication should be directed. | Optional |
| COM | 1 | A segment providing communication numbers for the financial institution identified in the FII segment and optionally for the contact identified in the associated CTA segment. | Optional |
| SG3 | 0 | SG3 | Optional |
| NAD | 1 | A segment identifying the name and address of the non-financial parties involved in the exchange of this message. (Sender and Recipient). | Mandatory |
| CTA | 1 | A segment identifying a person or department for the party specified in the NAD segment and to whom communication should be directed. | Optional |
| COM | 1 | A segment providing communication numbers for the party identified in the NAD segment and optionally for the contact identified in the associated CTA segment. | Optional |
| SG4 | 0 | SG4 | Optional |
| LIN | 1 | A segment specifying the beginning of details referring to the message/transaction to be authorized. | Mandatory |
| SG5 | 1 | SG5 | Mandatory |
| RFF | 2 | A segment indicating reference number(s) for the message or transaction to be authorized. | Mandatory |
| DTM | 2 | A segment specifying the date/time of the referenced message or transaction. | Optional |
| SG6 | 1 | SG6 | Optional |
| SEQ | 2 | A segment identifying the beginning of the details needed to give the authorization. | Mandatory |
| GEI | 2 | A segment specifying the kind of authorization given to the referenced message/transaction in a coded form. | Mandatory |
| DTM | 2 | A segment identifying dates related to the referenced message/transaction. | Optional |
| MOA | 2 | A segment giving the amount of the referenced message/transaction. | Optional |
| DOC | 2 | A segment identifying referenced numbers of the referenced message/transaction. | Optional |
| SG7 | 1 | SG7 | Optional |
| FII | 2 | A segment identifying a financial institution related to the referenced message/transaction. | Mandatory |
| CTA | 2 | A segment identifying a person or department for the party specified in the FII segment and to whom communication should be directed. | Optional |
| COM | 2 | A segment providing communication numbers for the party identified in the FII segment and optionally for the contact identified in the associated CTA segment. | Optional |
| SG8 | 1 | SG8 | Optional |
| NAD | 2 | A segment identifying a non-financial party related to the referenced message/transaction. | Mandatory |
| CTA | 2 | A segment identifying a person or a department for the party identified in the NAD segment and to whom communication should be directed. | Optional |
| COM | 2 | A segment identifying communications types and numbers for the persons or departments specified in the associated CTA segment. | Optional |
| CNT | 0 | A segment identifying the type of control checks and totals. | Optional |
| SG9 | 0 | SG9 | Optional |
| AUT | 1 | A segment specifying the details of any authentication (validation) procedure applied to the Authorisation message. | Mandatory |
| DTM | 1 | A segment defining the validation date/time. | Optional |
| UNT | 0 | A service segment ending a message, giving the total number of segments in the message (including the UNH & UNT) and the control reference number of the message. | Mandatory |
