IPN analysis (Instant Payment Notification URL (IPN))
I. Prerequisites: merchant server restrictions
- You must allow the IP address range 194.50.38.0/24 on your server.
- The source address when sending the IPN is within the 194.50.38.0/24 range.
- Link for IPN settings.
II. The transmitted data
| PARAMETER | Description | value |
|---|---|---|
| kr-hash | Hash of the JSON object stored in kr-answer. It allows to verify the authenticity of the response. | E.g.: c3c0323c748fdb7c2d24bd39ada99663526236828efa795193bebfdea022fe58 |
| kr-hash-algorithm | Algorithm used to calculate the hash. | Its value is sha256_hmac |
| kr-hash-key | HMAC-SHA-256 key ( 2nd key in the REST API key table ). Key used to sign kr-answer. | password (IPN case). |
| kr-answer-type | Type the JSON object stored in kr-answer. | E.g.: V4/Payment |
| kr-answer | Object containing the payment result, encoded in JSON. | Ex : {"shopId":"61881992","orderCycle":"CLOSED","orderStatus":"PAID", (...) |
III. Check the authenticity of the IPN
You must verify the authenticity of the received data.
hash_hmac- Encryption algorithm: sha256
- Secret key: the password that starts with testpassword** or prodpassword** ( 2nd key in the REST API key table ).
- Encoding base: hexadecimal (base 16).
Check the authenticity of the received message
- if the kr-hash is equal to the kr-answer encryption, the message is authentic.
Example of code in the example file: ipn.php
// STEP 1 : check the signature with the password
if (!checkHash($_POST, PASSWORD)) {
echo 'Invalid signature. <br/>';
echo '<pre>' . print_r($_POST, true) . '</pre>';
die();
}
$answer = array();
$answer['kr-hash'] = $_POST['kr-hash'];
$answer['kr-hash-algorithm'] = $_POST['kr-hash-algorithm'];
$answer['kr-answer-type'] = $_POST['kr-answer-type'];
$answer['kr-answer'] = json_decode($_POST['kr-answer'], true);
// STEP 2 : function to check the signature
function checkHash($data, $key){
$supported_sign_algos = array('sha256_hmac');
if (!in_array($data['kr-hash-algorithm'], $supported_sign_algos)) {
return false;
}
$kr_answer = str_replace('\/', '/', $data['kr-answer']);
$hash = hash_hmac('sha256', $kr_answer, $key);
return ($hash == $data['kr-hash']);
}IV. Checking the transaction status
Check the parameterorderStatuscontenu danskr-answer.
La valeurPAIDdu champorderStatusmeans that the transaction has been accepted.
More info: status references
Exemple de kr-answer, :
{
"shopId": "61881992",
"orderCycle": "CLOSED",
"orderStatus": "PAID",
"serverDate": "2022-01-21T09:28:17+00:00",
"orderDetails": {
"orderTotalAmount": 990,
"orderEffectiveAmount": 990,
"orderCurrency": "EUR",
"mode": "TEST",
"orderId": "myOrderId-475882",
"metadata": null,
"_type": "V4/OrderDetails"
},
"customer": {
"billingDetails": {
"address": null,
"category": null,
"cellPhoneNumber": null,
"city": null,
"country": null,
"district": null,
"firstName": null,
"identityCode": null,
"language": "FR",
"lastName": null,
"phoneNumber": null,
"state": null,
"streetNumber": null,
"title": null,
"zipCode": null,
"legalName": null,
"_type": "V4/Customer/BillingDetails"
},
"email": "sample@example.com",
"reference": null,
"shippingDetails": {
"address": null,
"address2": null,
"category": null,
"city": null,
"country": null,
"deliveryCompanyName": null,
"district": null,
"firstName": null,
"identityCode": null,
"lastName": null,
"legalName": null,
"phoneNumber": null,
"shippingMethod": null,
"shippingSpeed": null,
"state": null,
"streetNumber": null,
"zipCode": null,
"_type": "V4/Customer/ShippingDetails"
},
"extraDetails": {
"browserAccept": null,
"fingerPrintId": null,
"ipAddress": "185.244.73.2",
"browserUserAgent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/97.0.4692.71 Safari/537.36",
"_type": "V4/Customer/ExtraDetails"
},
"shoppingCart": {
"insuranceAmount": null,
"shippingAmount": null,
"taxAmount": null,
"cartItemInfo": null,
"_type": "V4/Customer/ShoppingCart"
},
"_type": "V4/Customer/Customer"
},
"transactions": [
{
"shopId": "61881992",
"uuid": "1c8356b0e24442b2acc579cf1ae4d814",
"amount": 990,
"currency": "EUR",
"paymentMethodType": "CARD",
"paymentMethodToken": null,
"status": "PAID",
"detailedStatus": "AUTHORISED",
"operationType": "DEBIT",
"effectiveStrongAuthentication": "ENABLED",
"creationDate": "2022-01-21T09:28:16+00:00",
"errorCode": null,
"errorMessage": null,
"detailedErrorCode": null,
"detailedErrorMessage": null,
"metadata": null,
"transactionDetails": {
"liabilityShift": "YES",
"effectiveAmount": 990,
"effectiveCurrency": "EUR",
"creationContext": "CHARGE",
"cardDetails": {
"paymentSource": "EC",
"manualValidation": "NO",
"expectedCaptureDate": "2022-01-27T09:38:10+00:00",
"effectiveBrand": "VISA",
"pan": "497011XXXXXX1003",
"expiryMonth": 12,
"expiryYear": 2025,
"country": "FR",
"issuerCode": 17807,
"issuerName": "Banque Populaire Occitane",
"effectiveProductCode": null,
"legacyTransId": "929936",
"legacyTransDate": "2022-01-21T09:28:16+00:00",
"paymentMethodSource": "NEW",
"authorizationResponse": {
"amount": 990,
"currency": "EUR",
"authorizationDate": "2022-01-21T09:28:16+00:00",
"authorizationNumber": "3fe205",
"authorizationResult": "0",
"authorizationMode": "FULL",
"_type": "V4/PaymentMethod/Details/Cards/CardAuthorizationResponse"
},
"captureResponse": {
"refundAmount": null,
"refundCurrency": null,
"captureDate": null,
"captureFileNumber": null,
"effectiveRefundAmount": null,
"effectiveRefundCurrency": null,
"_type": "V4/PaymentMethod/Details/Cards/CardCaptureResponse"
},
"threeDSResponse": {
"authenticationResultData": {
"transactionCondition": null,
"enrolled": null,
"status": null,
"eci": null,
"xid": null,
"cavvAlgorithm": null,
"cavv": null,
"signValid": null,
"brand": null,
"_type": "V4/PaymentMethod/Details/Cards/CardAuthenticationResponse"
},
"_type": "V4/PaymentMethod/Details/Cards/ThreeDSResponse"
},
"authenticationResponse": {
"id": "30eaa40d-dd76-4617-b527-4bed6240b81c",
"operationSessionId": "ae6f2ad3ffea41bb8faf1aefabad87b9",
"protocol": {
"name": "THREEDS",
"version": "2.1.0",
"network": "VISA",
"challengePreference": "NO_PREFERENCE",
"simulation": true,
"_type": "V4/Charge/Authenticate/Protocol"
},
"value": {
"authenticationType": "CHALLENGE",
"authenticationId": {
"authenticationIdType": "dsTransId",
"value": "bafdb21f-e3d6-4d1c-b4f6-d1668b7f7f21",
"_type": "V4/Charge/Authenticate/AuthenticationId"
},
"authenticationValue": {
"authenticationValueType": "CAVV",
"value": "BqLgDBHYRaCBpip3Fn3+erKT9vg=",
"_type": "V4/Charge/Authenticate/AuthenticationValue"
},
"status": "SUCCESS",
"commerceIndicator": "05",
"extension": {
"authenticationType": "THREEDS_V2",
"threeDSServerTransID": "30eaa40d-dd76-4617-b527-4bed6240b81c",
"dsTransID": "bafdb21f-e3d6-4d1c-b4f6-d1668b7f7f21",
"acsTransID": "bd6e58b4-6f37-4993-b428-9096766d83a6",
"_type": "V4/Charge/Authenticate/AuthenticationResultExtensionThreedsV2"
},
"reason": {
"_type": "V4/Charge/Authenticate/AuthenticationResultReason"
},
"_type": "V4/Charge/Authenticate/AuthenticationResult"
},
"_type": "V4/AuthenticationResponseData"
},
"installmentNumber": null,
"installmentCode": null,
"markAuthorizationResponse": {
"amount": null,
"currency": null,
"authorizationDate": null,
"authorizationNumber": null,
"authorizationResult": null,
"_type": "V4/PaymentMethod/Details/Cards/MarkAuthorizationResponse"
},
"cardHolderName": null,
"identityDocumentNumber": null,
"identityDocumentType": null,
"_type": "V4/PaymentMethod/Details/CardDetails"
},
"fraudManagement": {
"_type": "V4/PaymentMethod/Details/FraudManagement"
},
"subscriptionDetails": {
"subscriptionId": null,
"_type": "V4/PaymentMethod/Details/SubscriptionDetails"
},
"parentTransactionUuid": null,
"mid": "9999999",
"sequenceNumber": 1,
"taxAmount": null,
"preTaxAmount": null,
"taxRate": null,
"externalTransactionId": null,
"nsu": null,
"tid": "001",
"acquirerNetwork": "CB",
"taxRefundAmount": null,
"userInfo": "JS Client",
"paymentMethodTokenPreviouslyRegistered": null,
"occurrenceType": "UNITAIRE",
"_type": "V4/TransactionDetails"
},
"_type": "V4/PaymentTransaction"
}
],
"subMerchantDetails": null,
"_type": "V4/Payment"
}