Auth Source

This field contains a one-character code indicating the source of the authorization code.

If the transaction being settled was network authorized, this field must contain the value returned in the authorization response.
If the transaction is a credit or a refund, voice authorized, or otherwise processed offline, this field must contain one of the values in the following table:

Code	Description
6	Offline approval, POS device generated approval codes
7	Acquirer approval: BASE I unavailable
8	Acquirer approval of referral
9	Not authorized (includes credits/refunds)
B	Response provided by Visa Transaction Advisor Service
D	Referral: authorization code manually entered
E	Offline voice center or chip-approved transaction, manually entered approval code (referrals, for example)
F	CAFIS-generated response; post-authorization (Japan only)
G	Issuer Approval, Post-Authorization (Japan only)
H	Exceeds acquirer settlement risk exposure cap
N	No authorization required: Below floor limit
L	Late clearing - authorization previously obtained (clearing beyond 30 days)
V	Authorization obtained via VisaNet (Issuer or STIP response)
Space	Default value, if acquirer cannot define it

Note: Because this value comes from Visa, not all possible values may be listed.