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WEBHOOK
TRANSACTION_REVERSED
{
  "event":       "TRANSACTION_REVERSED",
  "eventId":     "evt_01HXY123456ABCDEF",
  "businessId":  "BUS1A2B3C4D5E6F",
  "environment": "LIVE",
  "timestamp":   "2026-05-22T14:00:00Z",
  "data": {
    "transactionId":        "txn_01HXYZ6666ABCDEF9999",
    "cardId":               "crd_01HXYZ5555ABCDEF1111",
    "cardholderId":         "chl_01HXYZ1234ABCDEF5678",
    "externalId":           "my-user-id-789",
    "type":                 "REVERSAL",
    "status":               "REVERSED",
    "amount":               29.99,
    "currency":             "USD",
    "billingAmount":        29.99,
    "billingCurrency":      "USD",
    "merchant": {
      "name":           "Amazon",
      "id":             "AMZN_MERCHANT_001",
      "city":           "Seattle",
      "country":        "US",
      "mcc":            "5999",
      "mccDescription": "Miscellaneous General Merchandise"
    }
  }
}

{}
Fires when a card transaction is reversed. This covers two scenarios:
  • Pre-settlement reversal: An authorization is voided before it clears — the reserved funds are released back to the card.
  • Post-settlement refund: A merchant issues a refund after the transaction has cleared — funds are credited back to the card.

​
Event Type

TRANSACTION_REVERSED

​
Payload

{
  "event":       "TRANSACTION_REVERSED",
  "eventId":     "evt_01HXY123456ABCDEF",
  "businessId":  "BUS1A2B3C4D5E6F",
  "environment": "LIVE",
  "timestamp":   "2026-05-22T14:00:00Z",
  "data": {
    "transactionId":        "txn_01HXYZ6666ABCDEF9999",
    "cardId":               "crd_01HXYZ5555ABCDEF1111",
    "cardholderId":         "chl_01HXYZ1234ABCDEF5678",
    "externalId":           "my-user-id-789",
    "type":                 "REVERSAL",
    "status":               "REVERSED",
    "amount":               29.99,
    "currency":             "USD",
    "billingAmount":        29.99,
    "billingCurrency":      "USD",
    "merchant": {
      "name":           "Amazon",
      "id":             "AMZN_MERCHANT_001",
      "city":           "Seattle",
      "country":        "US",
      "mcc":            "5999",
      "mccDescription": "Miscellaneous General Merchandise"
    }
  }
}

​
Payload Fields

FieldTypeDescription
transactionIdstringUnique transaction ID for this reversal event
typestringAlways REVERSAL for this event
statusstringAlways REVERSED for this event
amountnumberAmount reversed and returned to the card, in dollars
All other fields are the same as TRANSACTION_AUTHORIZED. See Transaction Events for the full field reference. 
{
  "event":       "TRANSACTION_REVERSED",
  "eventId":     "evt_01HXY123456ABCDEF",
  "businessId":  "BUS1A2B3C4D5E6F",
  "environment": "LIVE",
  "timestamp":   "2026-05-22T14:00:00Z",
  "data": {
    "transactionId":        "txn_01HXYZ6666ABCDEF9999",
    "cardId":               "crd_01HXYZ5555ABCDEF1111",
    "cardholderId":         "chl_01HXYZ1234ABCDEF5678",
    "externalId":           "my-user-id-789",
    "type":                 "REVERSAL",
    "status":               "REVERSED",
    "amount":               29.99,
    "currency":             "USD",
    "billingAmount":        29.99,
    "billingCurrency":      "USD",
    "merchant": {
      "name":           "Amazon",
      "id":             "AMZN_MERCHANT_001",
      "city":           "Seattle",
      "country":        "US",
      "mcc":            "5999",
      "mccDescription": "Miscellaneous General Merchandise"
    }
  }
}

{}

Authorizations

​
Authorization
string
header
required

API key from the FYATU CaaS portal. Pass as Authorization: Bearer <key>.

Body

application/json
​
event
string
Example:

"TRANSACTION_REVERSED"

​
eventId
string
​
businessId
string
​
environment
enum<string>
Available options:
LIVE,
SANDBOX
​
timestamp
string<date-time>
​
data
object

Response

200

Acknowledge the event.