diff --git a/openapi/openapiv2.json b/openapi/openapiv2.json
index dfe59394e..fb43f3594 100644
--- a/openapi/openapiv2.json
+++ b/openapi/openapiv2.json
@@ -7331,6 +7331,10 @@
             "type": "string"
           },
           "description": "Header to attach to callback request."
+        },
+        "token": {
+          "type": "string",
+          "format": "byte"
         }
       }
     },
diff --git a/openapi/openapiv3.yaml b/openapi/openapiv3.yaml
index 7c91c447f..5cb9d857f 100644
--- a/openapi/openapiv3.yaml
+++ b/openapi/openapiv3.yaml
@@ -7350,6 +7350,9 @@ components:
           additionalProperties:
             type: string
           description: Header to attach to callback request.
+        token:
+          type: string
+          format: bytes
     CanceledFailureInfo:
       type: object
       properties:
diff --git a/temporal/api/common/v1/message.proto b/temporal/api/common/v1/message.proto
index 838f5fefc..300788b47 100644
--- a/temporal/api/common/v1/message.proto
+++ b/temporal/api/common/v1/message.proto
@@ -173,6 +173,9 @@ message Callback {
         string url = 1;
         // Header to attach to callback request.
         map<string, string> header = 2;
+        // A token that is used to recreated context when handling the callback request.
+        // Supported from server version 1.30.
+        bytes token = 3;
     }
 
     // Callbacks to be delivered internally within the system.