diff --git a/pkg/internal/oas_client_gen.go b/pkg/internal/oas_client_gen.go
index b77f188..f447073 100644
--- a/pkg/internal/oas_client_gen.go
+++ b/pkg/internal/oas_client_gen.go
@@ -200,6 +200,24 @@ func (c *Client) sendActionSubmissionAccepted(ctx context.Context, params Action
 	pathParts[2] = "/status/validator-failed"
 	uri.AddPathParts(u, pathParts[:]...)
 
+	stage = "EncodeQueryParams"
+	q := uri.NewQueryEncoder()
+	{
+		// Encode "StatusMessage" parameter.
+		cfg := uri.QueryParameterEncodingConfig{
+			Name:    "StatusMessage",
+			Style:   uri.QueryStyleForm,
+			Explode: true,
+		}
+
+		if err := q.EncodeParam(cfg, func(e uri.Encoder) error {
+			return e.EncodeValue(conv.StringToString(params.StatusMessage))
+		}); err != nil {
+			return res, errors.Wrap(err, "encode query")
+		}
+	}
+	u.RawQuery = q.Values().Encode()
+
 	stage = "EncodeRequest"
 	r, err := ht.NewRequest(ctx, "POST", u)
 	if err != nil {
diff --git a/pkg/internal/oas_handlers_gen.go b/pkg/internal/oas_handlers_gen.go
index 1ecc42d..40cbf2d 100644
--- a/pkg/internal/oas_handlers_gen.go
+++ b/pkg/internal/oas_handlers_gen.go
@@ -128,6 +128,10 @@ func (s *Server) handleActionSubmissionAcceptedRequest(args [1]string, argsEscap
 					Name: "SubmissionID",
 					In:   "path",
 				}: params.SubmissionID,
+				{
+					Name: "StatusMessage",
+					In:   "query",
+				}: params.StatusMessage,
 			},
 			Raw: r,
 		}
diff --git a/pkg/internal/oas_parameters_gen.go b/pkg/internal/oas_parameters_gen.go
index b2b1d9c..d138660 100644
--- a/pkg/internal/oas_parameters_gen.go
+++ b/pkg/internal/oas_parameters_gen.go
@@ -18,7 +18,8 @@ import (
 // ActionSubmissionAcceptedParams is parameters of actionSubmissionAccepted operation.
 type ActionSubmissionAcceptedParams struct {
 	// The unique identifier for a submission.
-	SubmissionID int64
+	SubmissionID  int64
+	StatusMessage string
 }
 
 func unpackActionSubmissionAcceptedParams(packed middleware.Parameters) (params ActionSubmissionAcceptedParams) {
@@ -29,10 +30,18 @@ func unpackActionSubmissionAcceptedParams(packed middleware.Parameters) (params
 		}
 		params.SubmissionID = packed[key].(int64)
 	}
+	{
+		key := middleware.ParameterKey{
+			Name: "StatusMessage",
+			In:   "query",
+		}
+		params.StatusMessage = packed[key].(string)
+	}
 	return params
 }
 
 func decodeActionSubmissionAcceptedParams(args [1]string, argsEscaped bool, r *http.Request) (params ActionSubmissionAcceptedParams, _ error) {
+	q := uri.NewQueryDecoder(r.URL.Query())
 	// Decode path: SubmissionID.
 	if err := func() error {
 		param := args[0]
@@ -78,6 +87,58 @@ func decodeActionSubmissionAcceptedParams(args [1]string, argsEscaped bool, r *h
 			Err:  err,
 		}
 	}
+	// Decode query: StatusMessage.
+	if err := func() error {
+		cfg := uri.QueryParameterDecodingConfig{
+			Name:    "StatusMessage",
+			Style:   uri.QueryStyleForm,
+			Explode: true,
+		}
+
+		if err := q.HasParam(cfg); err == nil {
+			if err := q.DecodeParam(cfg, func(d uri.Decoder) error {
+				val, err := d.DecodeValue()
+				if err != nil {
+					return err
+				}
+
+				c, err := conv.ToString(val)
+				if err != nil {
+					return err
+				}
+
+				params.StatusMessage = c
+				return nil
+			}); err != nil {
+				return err
+			}
+			if err := func() error {
+				if err := (validate.String{
+					MinLength:    0,
+					MinLengthSet: true,
+					MaxLength:    4096,
+					MaxLengthSet: true,
+					Email:        false,
+					Hostname:     false,
+					Regex:        nil,
+				}).Validate(string(params.StatusMessage)); err != nil {
+					return errors.Wrap(err, "string")
+				}
+				return nil
+			}(); err != nil {
+				return err
+			}
+		} else {
+			return err
+		}
+		return nil
+	}(); err != nil {
+		return params, &ogenerrors.DecodeParamError{
+			Name: "StatusMessage",
+			In:   "query",
+			Err:  err,
+		}
+	}
 	return params, nil
 }