diff --git a/BTCPayServer.Client/Models/WebhookEvent.cs b/BTCPayServer.Client/Models/WebhookEvent.cs
index b117919f8..afedd6459 100644
--- a/BTCPayServer.Client/Models/WebhookEvent.cs
+++ b/BTCPayServer.Client/Models/WebhookEvent.cs
@@ -19,7 +19,31 @@ namespace BTCPayServer.Client.Models
         }
         public string DeliveryId { get; set; }
         public string WebhookId { get; set; }
-        public string OrignalDeliveryId { get; set; }
+        string _OriginalDeliveryId;
+        public string OriginalDeliveryId
+        {
+            get
+            {
+                if (_OriginalDeliveryId is null)
+                {
+                    // Due to a typo in old version, we serialized `orignalDeliveryId` rather than `orignalDeliveryId`
+                    // We silently fix that here.
+                    // Note we can remove this code later on, as old webhook event are unlikely to be useful to anyone,
+                    // and having a null orignalDeliveryId is not end of the world
+                    if (AdditionalData != null &&
+                        AdditionalData.TryGetValue("orignalDeliveryId", out var tok))
+                    {
+                        _OriginalDeliveryId = tok.Value<string>();
+                        AdditionalData.Remove("orignalDeliveryId");
+                    }
+                }
+                return _OriginalDeliveryId;
+            }
+            set
+            {
+                _OriginalDeliveryId = value;
+            }
+        }
         public bool IsRedelivery { get; set; }
         [JsonConverter(typeof(StringEnumConverter))]
         public WebhookEventType Type { get; set; }
diff --git a/BTCPayServer.Tests/GreenfieldAPITests.cs b/BTCPayServer.Tests/GreenfieldAPITests.cs
index 195e80d21..f43a12f1d 100644
--- a/BTCPayServer.Tests/GreenfieldAPITests.cs
+++ b/BTCPayServer.Tests/GreenfieldAPITests.cs
@@ -687,7 +687,7 @@ namespace BTCPayServer.Tests
                 Assert.NotNull(newDelivery);
                 Assert.Equal(404, newDelivery.HttpCode);
                 var req = await clientProfile.GetWebhookDeliveryRequest(user.StoreId, hook.Id, newDeliveryId);
-                Assert.Equal(delivery.Id, req.OrignalDeliveryId);
+                Assert.Equal(delivery.Id, req.OriginalDeliveryId);
                 Assert.True(req.IsRedelivery);
                 Assert.Equal(WebhookDeliveryStatus.HttpError, newDelivery.Status);
             });
diff --git a/BTCPayServer.Tests/UnitTest1.cs b/BTCPayServer.Tests/UnitTest1.cs
index 0dbf55809..f2dadb392 100644
--- a/BTCPayServer.Tests/UnitTest1.cs
+++ b/BTCPayServer.Tests/UnitTest1.cs
@@ -3175,6 +3175,18 @@ namespace BTCPayServer.Tests
             }
         }
 
+        [Trait("Fast", "Fast")]
+        [Fact]
+        public void CanFixupWebhookEventPropertyName()
+        {
+            string legacy = "{\"orignalDeliveryId\":\"blahblah\"}";
+            var obj = JsonConvert.DeserializeObject<WebhookEvent>(legacy, WebhookEvent.DefaultSerializerSettings);
+            Assert.Equal("blahblah", obj.OriginalDeliveryId);
+            var serialized = JsonConvert.SerializeObject(obj, WebhookEvent.DefaultSerializerSettings);
+            Assert.DoesNotContain("orignalDeliveryId", serialized);
+            Assert.Contains("originalDeliveryId", serialized);
+        }
+
         [Fact(Timeout = LongRunningTestTimeout)]
         [Trait("Fast", "Fast")]
         public async Task CanCreateSqlitedb()
diff --git a/BTCPayServer/HostedServices/WebhookNotificationManager.cs b/BTCPayServer/HostedServices/WebhookNotificationManager.cs
index bef2fb210..ee4d90f2a 100644
--- a/BTCPayServer/HostedServices/WebhookNotificationManager.cs
+++ b/BTCPayServer/HostedServices/WebhookNotificationManager.cs
@@ -101,7 +101,7 @@ namespace BTCPayServer.HostedServices
             webhookEvent.DeliveryId = newDelivery.Id;
             webhookEvent.WebhookId = webhookDelivery.Webhook.Id;
             // if we redelivered a redelivery, we still want the initial delivery here
-            webhookEvent.OrignalDeliveryId ??= deliveryId;
+            webhookEvent.OriginalDeliveryId ??= deliveryId;
             webhookEvent.IsRedelivery = true;
             newDeliveryBlob.Request = ToBytes(webhookEvent);
             newDelivery.SetBlob(newDeliveryBlob);
@@ -125,7 +125,7 @@ namespace BTCPayServer.HostedServices
                     webhookEvent.StoreId = invoiceEvent.Invoice.StoreId;
                     webhookEvent.DeliveryId = delivery.Id;
                     webhookEvent.WebhookId = webhook.Id;
-                    webhookEvent.OrignalDeliveryId = delivery.Id;
+                    webhookEvent.OriginalDeliveryId = delivery.Id;
                     webhookEvent.IsRedelivery = false;
                     webhookEvent.Timestamp = delivery.Timestamp;
                     var context = new WebhookDeliveryRequest(webhook.Id, webhookEvent, delivery, webhookBlob);