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Webhooks

Monek uses Svix to send secure webhook notifications to merchants when important transaction events occur, including sales, refunds, and reversals.

Configure Webhook

To receive webhook notifications you'll need a public HTTP POST URL on your server that can receive and process the webhook JSON payloads.

Your webhook URL can be registered via the Monek Portal on the Setting\Integrations page.

tip

This functionality is currently in pilot. To enable this option for your merchant please contact Monek Support

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Webhook Payload

Each webhook event includes detailed transaction data

NameDescription
DataThe main Webhook node containing transaction details. See Webhook Data.
EventIdUnique identifier for this webhook and also the Monek Cross Reference for this transaction.
EventTypeThe type of event this webhook contains. See Event Types.
MetadataAdditional information relating to this webhook.
TimestampThe data and time of the transaction represented by this webhook.

Webhook Data

NameDescription
AmountThe transaction amount minor currency.
AuthorisationCodeThe authorisation code for a successful transaction.
AvsCv2DescriptionDescription of the AVS/CV2 check result.
AvsCv2ResultRaw code for the AVS/CV2 result. See AVS/CV2 Response Values.
CardTypeCard type code. See Card Type Values.
CardholderAddressThe cardholder's billing address.
CardholderEmailThe cardholder's email address.
CardholderNameThe cardholder's name.
CardholderPhoneNumberThe cardholder's phone number.
CountryCodeThe merchant's country code.
CrossReferenceThe unique character string returned by TransactDirect to identify this transaction.
CurrencyCodeThe currency code used for the transaction.
IdempotencyTokenThe idempotency token specified for this transaction.
Last4DigitsThe last 4 digits of the payment card.
MerchantDataAdditional merchant data provided by the merchant. Typically JSON or Base64 encoded.
MerchantNameThe merchant name.
MessageMessage indicating the result of this transaction.
MessageTypeThe message type for this transaction. See Message Types.
MonekIdThe Monek Merchant ID for this merchant.
ParentReferenceContains the Cross Reference of the originating transaction.
e.g. For completion of Pre-Auth, or Refund or Recharge of a previous transaction.
PaymentChannelPayment channel provided by the merchant for this transaction.
PaymentDetailAdditional payment details provided by the merchant. Typically JSON or Base64 encoded.
PaymentReferenceThe ID provided by the merchant to identify the transaction.
ResponseCodeThe TransactDirect response code. See Response Code Values.
ThreeDSecureResultThe 3-D Secure transaction result code.
ThreeDSecureVersionThe 3-D Secure version used.
TransactionDateTimeThe date and time this transaction was processed.

Webhook Example

{
"Data": {
"Amount": "1",
"AuthorisationCode": "713871",
"AvsCv2Description": "SECURITY CODE MATCH ONLY",
"AvsCv2Result": "211100",
"CardType": "VC",
"CardholderAddress": "",
"CardholderEmail": "test@monek.com",
"CardholderName": "Test Cardholder Name",
"CardholderPhoneNumber": "",
"CountryCode": "826",
"CrossReference": "250613125457713871GD4",
"CurrencyCode": "826",
"IdempotencyToken": "177834ab-55f4-4caa-a4f7-3e789d81d9fe",
"Last4Digits": "0216",
"MerchantData": "",
"MerchantName": "Test Account",
"Message": "AUTH CODE:713871",
"MessageType": "SALE_CNP_TO[INTERNET]",
"MonekId": "0000893",
"ParentReference": "",
"PaymentChannel": "",
"PaymentDetail": "Test VT",
"PaymentReference": "Test VT",
"ResponseCode": "00",
"ThreeDSecureResult": "",
"ThreeDSecureVersion": "",
"TransactionDateTime": "2025-06-13T12:54:57.36+00:00"
},
"EventId": "250613125457713871GD4",
"EventType": "sale.success",
"Metadata": {
"Application": {
"Name": "Test Account",
"PayloadRetentionPeriod": 90,
"Source": "Monek.PaymentService",
"Uid": "0000893"
}
},
"Timestamp": "2025-06-13T12:54:57.36+00:00"
}

Event Types

Each webhook includes an EventType field which indicates the type of transaction and result of the transaction in the form type.result. For example sale.success would indicate a sale transaction that was successfully authorised.

TypeDescription
saleA sale transaction
verifyAn account verification transaction
refundA refund transaction
reversalA transaction reversal
unknownAn unknown or unsupported transaction type. e.g. When an invalid message type was used
ResultDescription
successTransaction was successful
referTransaction was referred for further checks
declineTransaction was declined
errorAn error occurred processing this transaction
tip

Handle new or unknown types defensively. For example by logging them for review and implementation.

Verifying Webhook Authenticity

Because of the way webhooks work, attackers can impersonate services by simply sending a fake webhook to an endpoint. This is a potential security hole for many applications.

In order to prevent it, every webhook and its metadata is signed with a unique key for each endpoint. This signature can then be used to verify the webhook is genuine.

There are two options to verify authenticity

Verify Webhooks with Svix Libraries

Details on how to verify webhooks using Svix libraries are available at How to Verify Webhooks with the Svix Libraries

Examples are provided for various languages including C#, PHP, Python, JavaScript, and more.

Manual Verification

Advanced integrations may implement their own HMAC-based signature checking. Learn more about this at Verifying Webhooks Manually.

Secret Key

Your secret key is available via the Svix Dashboard. You can rotate your secret key there at any time.

Source IP Addresses

In case your webhook receiving endpoint is behind a firewall or NAT, you may need to allow traffic from Svix's Static Source IP addresses.

Current IP Addresses (EU Region)

52.215.16.239
54.216.8.72
63.33.109.123
2a05:d028:17:8000::/56