diff --git a/json/Webhooks-v1.json b/json/Webhooks-v1.json
index c39ba9d5..47e2730f 100644
--- a/json/Webhooks-v1.json
+++ b/json/Webhooks-v1.json
@@ -1752,6 +1752,10 @@
          "AuthorisationNotificationAdditionalData" : {
             "additionalProperties" : false,
             "properties" : {
+               "GoPay.gopayAccountId" : {
+                  "description" : "A GoPay shopper's wallet ID. Used by merchant for Risk and Fraud checks.",
+                  "type" : "string"
+               },
                "PaymentAccountReference" : {
                   "type" : "string"
                },
@@ -5556,6 +5560,10 @@
          "RecurringContractNotificationAdditionalData" : {
             "additionalProperties" : false,
             "properties" : {
+               "GoPay.gopayAccountId" : {
+                  "description" : "A GoPay shopper's wallet ID. Used by merchant for Risk and Fraud checks.",
+                  "type" : "string"
+               },
                "PaymentAccountReference" : {
                   "description" : "Reference of the payment account.",
                   "type" : "string"
diff --git a/yaml/Webhooks-v1.yaml b/yaml/Webhooks-v1.yaml
index 99cf2145..29b00ab8 100644
--- a/yaml/Webhooks-v1.yaml
+++ b/yaml/Webhooks-v1.yaml
@@ -1337,6 +1337,10 @@ components:
     AuthorisationNotificationAdditionalData:
       additionalProperties: false
       properties:
+        GoPay.gopayAccountId:
+          description: A GoPay shopper's wallet ID. Used by merchant for Risk and
+            Fraud checks.
+          type: string
         PaymentAccountReference:
           type: string
         accountValidation:
@@ -4596,6 +4600,10 @@ components:
     RecurringContractNotificationAdditionalData:
       additionalProperties: false
       properties:
+        GoPay.gopayAccountId:
+          description: A GoPay shopper's wallet ID. Used by merchant for Risk and
+            Fraud checks.
+          type: string
         PaymentAccountReference:
           description: Reference of the payment account.
           type: string