BAU Beginning Segment for the Debit Authorization

To identify the beginning of the Debit Authorization Transaction Set; the BAU segment is used to identify the financial institution and account of the payer (i.e., the party authorizing the debit against its account)

Position
Element
Name
Type
Requirement
Min
Max
Repeat
BAU01
Reference Identification
String (AN)
Mandatory
1
50
1
Reference information as defined for a particular Transaction Set or as specified by the Reference Identification Qualifier
BAU01 is assigned by the account holder's application and relevant as an application trace number.
BAU02
Payment Method Code
Identifier (ID)
Mandatory
3
3
1
Code identifying the method for the movement of payment instructions
BAU03
(DFI) ID Number Qualifier
Identifier (ID)
Mandatory
2
2
1
Code identifying the type of identification number of Depository Financial Institution (DFI)
BAU04
(DFI) Identification Number
String (AN)
Mandatory
3
12
1
Depository Financial Institution (DFI) identification number
BAU05
Account Number
String (AN)
Mandatory
1
35
1
Account number assigned
BAU06
Name
String (AN)
Optional
1
60
1
Free-form name
BAU06 identifies the party holding the account being debited. If used, it further serves to identify the account holder to the financial institution.

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