An authorization request was approved. The available balance has changed.

Event code AAAU is for completions (advice), reversal notifications, AVS-only checks, and yellow-path tokenization requests.

Event code BAUT is for all other authorization requests except ATM balance inquiries (AABI: bal) and card loads (AAPM: auth_payment).

  • CodesAAAU, BAUT
  • Event trigger — You or Galileo approve an authorization request.
  • Processes — These processes contain the event trigger:
    • AAAU
      Galileo receives one of these messages from the card network:
      • Preauthorization completion
      • Preauthorization reversal
      • Reversal notification
      • AVS-only request
      • A tokenization request that entered the yellow path
      • Advice notification of an approved STIP transaction
    • BAUT
      Galileo receives one of these messages from the card network:
      • Preauthorization request
      • Authorization request


The data elements (DEs) in the field descriptions may vary by network. All fields are strings. Your field names may vary. Default fields are included in the default webhook template. See Default and optional fields for more information.

Field Default Description
act_type X

See Activity Type for possible values. This field is not returned for AAAU messages that have no dollar amount. Example: "VI"

amount X

BAUT only. The amount of the authorization request. Includes fees and upcharges. DE004 times the conversion rate in DE009. The amount is signed: - to debit the account and + to credit the account. Example: "10.25"


AAAU only. Amount of the transaction in cents. The amount is signed: - to debit the account and + to credit the account. Example: "26100"


BAUT only. Contents of the Auth API webhook for this transaction. Stringified JSON.

auth_id X

Galileo-generated ID for the authorization request. This ID is unique per subnetwork. Example: "12303090"


Authorization identification response, a numeric code that Galileo returns to a merchant to verify that the transaction was authorized. DE038. Example: "012547"


Based on DE003, processing code. Type of authorization request. See Authorization types for possible values. Example: "5"


For debit accounts, the open_to_buy plus available overdraft. Example: "143.11"


For credit accounts, the available credit limit to spend. Example: "432.00"

balance_id X

The balance ID, also called the galileo_account_number. Example: "20211"


Amount to be billed in the currency of the cardholder account (DE006). Example: "24.35"


Currency code for billing_amt (DE051). Example: "840"

cad X

Galileo-generated card ID. Example: "12534"


AAAU only. Whether this is a card-not-present transaction. Y is card-not-present; N is card-present. Example: "Y"


Amount of the transaction that is cashback instead of purchase. This amount is included in amount. Example: "20.00"


ID for the customer record. Example: "264539"


For credit accounts, the total amount of unpaid purchases and advances. Example: "325.00"


Whether the transaction arrived at Galileo over credit or debit rails. Y is credit; N is debit. Example: "Y"


Currency code for amount, which is the currency of the cardholder account.. Example: "840"


Raw contents of DE003, processing code. See DE003 Codes for possible values. Example: "002000"


Raw contents of DE022, POS entry mode. See DE022 Codes for possible values. Example: "071"


AAAU only. Raw contents of DE025 for Visa and Discover, POS condition. See DE025 Codes for possible values. Example: "00"


Whether this is a domestic transaction. Y is domestic; N is international. Example: "Y"


Program transaction fee. Example: "2.00"


The financial bank card product or branding of the card. DE063SE1. Valid values: CI (Cirrus), MC (Mastercard credit), MD (Debit Mastercard), MS (Maestro), PL (Visa Plus), PV (Private Label), VI (Visa) Example: "MS"


Driver ID. Fleet cards only. Example: "06123456"


Vehicle ID. Fleet cards only. Example: "03123"


The available balance of the RTF or Corporate Credit funding account after this transaction takes place. Example: "24365.90"


The PRN of the RTF or Corporate Credit funding account that is associated with this spending account. Example: "122101354223"


Currency code for local_currency_amount (DE049). Example: "124"


Amount of the transaction in the currency at the point of sale (DE004). No fees or upcharges included. Example: "1245.20"


The surcharge amount (DE028) added by the merchant or ATM operator. This amount is included in amount. Example: "2.50"


Contents of DE112 SE7. See MSI Installments data to interpret the code. Example: "030600484"


Contents of DE048 SE95. See MSI Installments data to interpret the code. Example: "MEXCTA"

mcc X

Merchant category code (DE018). Example: "5712"


AAAU only. Concatenation of merchant_name and merchant_location. Example: "RIDESHARE.COM/CHARGES, SAN FRANCISCO, CA"

merchant_location X

Merchant city and state (from remaining part of ISO DE043). Example: "NEW YORK, NY"

merchant_name X

Merchant name (first 22 characters of DE043). Should not be used for matching; instead, use merchant_number. Example: "Widgets Incorporated"

merchant_number X

Merchant number (DE042). Example: "L4DIV6D5LM4X7LF"


The postal code for the merchant. Example: "10021"


Unique Galileo-generated identifier for this message. Example: "243693"


The four-letter code to identify this event. Example: "AAAU"


BAUT only. ISO 8583 message-type indicator. 4 digits. Example: "0200"

network X

See Events Network Codes for possible values. Example: "V"

open_to_buy X

The available balance to spend. Example: "500.00"


The exact date-time at which open_to_buy was captured. Format: YYYY-MM-DD hh:mm:ss.ssssss Example:"2023-03-17 14:06:50.243654"`

original_auth_id X

The ID of a prior authorization in the sequence. For example, for a completion, this is the auth_id of the preauthorization. For a reversal, this is the auth_id of the transaction that is being reversed. Example: "12303085"

otype X

See Transaction Types for possible values. Example: "W"


BAUT only. The available balance immediately after the authorized amount was applied to the cardholder account.

pmt_ref_no X

Galileo 12-digit payment reference number (PRN) for the account. Example: "155101003022"

prod_id X

The product ID of the account. Example: "1701"

prog_id X

The program ID of the account. Example: "305"

response_code X

See Authorization Response Codes for possible values. Example: "05"


Pipe-delimited list of factors that were calculated for response_code. Example: "Acquiring merchant blocked by product|Suspected fraud"


Risk score provided by the network. Higher numbers mean higher risk. Example: "26"


Retrieval reference number (DE037). Format: Julian date YDDDxxxxxxxx Example: "314293027549"

rules_results X

Comma-delimited list of DENY, WARN or FREEZE rules from Galileo's dynamic fraud engine. Example: "hr_crypto:DENY, intl_cnp_ecom:DENY"


Currency code for settle_currency_amount. Example: "840"


Amount of the settlement in the currency of the cardholder account. Example: "35.44"


Contains - (minus sign) when the amount debits the open_to_buy. Example: "-"


System trace audit number, a unique identifier assigned to each transaction by the originator of the message. DE011. Example: "000803"

timestamp X

Date-time when this event was created in Mountain Standard Time (GMT -0700). Format: YYYY-MM-DD hh:mm:ss MST Example: "2025-01-31 17:20:33 MST"


BAUT only. Name of the entity that is requesting a tokenized version of the card. Example: "Apple Inc."


BAUT only. Identifier for "token_requester". Example: "40010030273"


Name of token requester. Example: "Apple Inc."

type X

The name of this event: "auth"


Populated according to your use case and needs by arrangement with Galileo.


# auth example:
  "act_type": "AU",
  "amount": "-77.00",
  "auth_id": "12303090",
  "auth_id_response": "012547",
  "balance_id": "20211",
  "billing_amt": "77",
  "billing_curr_code": "840",
  "cad": "12534",
  "card_not_present": "N",
  "client_id": "264539",
  "currency": "840",
  "financial_network_code": "MS",
  "fleet_card_driver_number": "06123456",
  "fleet_card_vehicle_number": "03123",
  "local_currency": "840",
  "mc_installment_pmt_data": "030600484",
  "mc_promotion_code": "MEXCTA",
  "mcc": "5712",
  "merchant_location": "PERRY, GA",
  "merchant_name": "AT&T RNCP 136300",
  "merchant_number": "000844017654881",
  "mti": "110",
  "network": "M",
  "open_to_buy": "-7.58",
  "original_auth_id": "0",
  "otype": "A",
  "pmt_ref_no": "155101003022",
  "prod_id": "1701",
  "prog_id": "305",
  "response_code": "00",
  "sign_amount": "-",
  "stan": "000803",
  "timestamp": "2025-01-31 17:20:33 MST",
  "token_requester_id": "50110030273",
  "token_type": "Apple Inc.",
  "type": "auth"