diff --git a/src/Plugins/BotSharp.Plugin.Membase/Interfaces/IMembaseApi.cs b/src/Plugins/BotSharp.Plugin.Membase/Interfaces/IMembaseApi.cs
index 124fd1d19..f210c86d9 100644
--- a/src/Plugins/BotSharp.Plugin.Membase/Interfaces/IMembaseApi.cs
+++ b/src/Plugins/BotSharp.Plugin.Membase/Interfaces/IMembaseApi.cs
@@ -58,5 +58,8 @@ public interface IMembaseApi
 
     [Post("/graph/{graphId}/pgt-definitions/{definitionId}/validate")]
     Task<PgtValidationResponse> ValidatePgtDefinitionAsync(string graphId, string definitionId, [Body] PgtValidationRequest request);
+
+    [Post("/graph/{graphId}/pgt-external/{correlationId}/complete")]
+    Task<PgtExternalCompleteResponse> CompletePgtExternalAsync(string graphId, string correlationId);
     #endregion
 }
diff --git a/src/Plugins/BotSharp.Plugin.Membase/Models/Responses/PgtExternalCompleteResponse.cs b/src/Plugins/BotSharp.Plugin.Membase/Models/Responses/PgtExternalCompleteResponse.cs
new file mode 100644
index 000000000..d1f513be8
--- /dev/null
+++ b/src/Plugins/BotSharp.Plugin.Membase/Models/Responses/PgtExternalCompleteResponse.cs
@@ -0,0 +1,42 @@
+using System.Text.Json.Serialization;
+
+namespace BotSharp.Plugin.Membase.Models;
+
+public class PgtExternalCompleteResponse
+{
+    public PgtExternalTask Task { get; set; } = new();
+
+    [JsonPropertyName("already_completed")]
+    public bool AlreadyCompleted { get; set; }
+}
+
+public class PgtExternalTask
+{
+    public string TaskId { get; set; } = string.Empty;
+    public string RunId { get; set; } = string.Empty;
+    public string GraphId { get; set; } = string.Empty;
+    public string NodeId { get; set; } = string.Empty;
+    public string TaskType { get; set; } = string.Empty;
+    public string CorrelationId { get; set; } = string.Empty;
+    public string Status { get; set; } = string.Empty;
+
+    [JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingNull)]
+    public Dictionary<string, object>? Request { get; set; }
+
+    [JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingNull)]
+    public Dictionary<string, object>? Response { get; set; }
+
+    [JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingNull)]
+    public object? Error { get; set; }
+
+    public DateTime CreatedAt { get; set; }
+    public DateTime UpdatedAt { get; set; }
+
+    [JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingNull)]
+    public DateTime? CompletedAt { get; set; }
+
+    public long NotBefore { get; set; }
+
+    [JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingNull)]
+    public DateTime? ClaimedAt { get; set; }
+}