diff --git a/openapi.yaml b/openapi.yaml
index 3243d1c..70d2b51 100644
--- a/openapi.yaml
+++ b/openapi.yaml
@@ -62,7 +62,7 @@ paths:
           content:
             application/json:
               schema:
-                $ref: "#/components/schemas/Submission"
+                $ref: "#/components/schemas/Id"
         default:
           description: General Error
           content:
@@ -186,6 +186,12 @@ paths:
                 $ref: "#/components/schemas/Error"
 components:
   schemas:
+    Id:
+      type: object
+      properties:
+        ID:
+          type: integer
+          format: int64
     User:
       type: object
       properties:
diff --git a/pkg/api/oas_client_gen.go b/pkg/api/oas_client_gen.go
index cef6955..38e1cd5 100644
--- a/pkg/api/oas_client_gen.go
+++ b/pkg/api/oas_client_gen.go
@@ -28,7 +28,7 @@ type Invoker interface {
 	// Create new submission.
 	//
 	// POST /submissions
-	CreateSubmission(ctx context.Context) (*Submission, error)
+	CreateSubmission(ctx context.Context) (*ID, error)
 	// GetSubmission invokes getSubmission operation.
 	//
 	// Retrieve map with ID.
@@ -118,12 +118,12 @@ func (c *Client) requestURL(ctx context.Context) *url.URL {
 // Create new submission.
 //
 // POST /submissions
-func (c *Client) CreateSubmission(ctx context.Context) (*Submission, error) {
+func (c *Client) CreateSubmission(ctx context.Context) (*ID, error) {
 	res, err := c.sendCreateSubmission(ctx)
 	return res, err
 }
 
-func (c *Client) sendCreateSubmission(ctx context.Context) (res *Submission, err error) {
+func (c *Client) sendCreateSubmission(ctx context.Context) (res *ID, err error) {
 	otelAttrs := []attribute.KeyValue{
 		otelogen.OperationID("createSubmission"),
 		semconv.HTTPRequestMethodKey.String("POST"),
diff --git a/pkg/api/oas_handlers_gen.go b/pkg/api/oas_handlers_gen.go
index c44efe8..c8b22fe 100644
--- a/pkg/api/oas_handlers_gen.go
+++ b/pkg/api/oas_handlers_gen.go
@@ -65,7 +65,7 @@ func (s *Server) handleCreateSubmissionRequest(args [0]string, argsEscaped bool,
 		err error
 	)
 
-	var response *Submission
+	var response *ID
 	if m := s.cfg.Middleware; m != nil {
 		mreq := middleware.Request{
 			Context:          ctx,
@@ -80,7 +80,7 @@ func (s *Server) handleCreateSubmissionRequest(args [0]string, argsEscaped bool,
 		type (
 			Request  = struct{}
 			Params   = struct{}
-			Response = *Submission
+			Response = *ID
 		)
 		response, err = middleware.HookMiddleware[
 			Request,
diff --git a/pkg/api/oas_json_gen.go b/pkg/api/oas_json_gen.go
index 7ab9de0..efde54a 100644
--- a/pkg/api/oas_json_gen.go
+++ b/pkg/api/oas_json_gen.go
@@ -125,6 +125,69 @@ func (s *Error) UnmarshalJSON(data []byte) error {
 	return s.Decode(d)
 }
 
+// Encode implements json.Marshaler.
+func (s *ID) Encode(e *jx.Encoder) {
+	e.ObjStart()
+	s.encodeFields(e)
+	e.ObjEnd()
+}
+
+// encodeFields encodes fields.
+func (s *ID) encodeFields(e *jx.Encoder) {
+	{
+		if s.ID.Set {
+			e.FieldStart("ID")
+			s.ID.Encode(e)
+		}
+	}
+}
+
+var jsonFieldsNameOfID = [1]string{
+	0: "ID",
+}
+
+// Decode decodes ID from json.
+func (s *ID) Decode(d *jx.Decoder) error {
+	if s == nil {
+		return errors.New("invalid: unable to decode ID to nil")
+	}
+
+	if err := d.ObjBytes(func(d *jx.Decoder, k []byte) error {
+		switch string(k) {
+		case "ID":
+			if err := func() error {
+				s.ID.Reset()
+				if err := s.ID.Decode(d); err != nil {
+					return err
+				}
+				return nil
+			}(); err != nil {
+				return errors.Wrap(err, "decode field \"ID\"")
+			}
+		default:
+			return d.Skip()
+		}
+		return nil
+	}); err != nil {
+		return errors.Wrap(err, "decode ID")
+	}
+
+	return nil
+}
+
+// MarshalJSON implements stdjson.Marshaler.
+func (s *ID) MarshalJSON() ([]byte, error) {
+	e := jx.Encoder{}
+	s.Encode(&e)
+	return e.Bytes(), nil
+}
+
+// UnmarshalJSON implements stdjson.Unmarshaler.
+func (s *ID) UnmarshalJSON(data []byte) error {
+	d := jx.DecodeBytes(data)
+	return s.Decode(d)
+}
+
 // Encode encodes bool as json.
 func (o OptBool) Encode(e *jx.Encoder) {
 	if !o.Set {
diff --git a/pkg/api/oas_response_decoders_gen.go b/pkg/api/oas_response_decoders_gen.go
index 8e53340..02ca7ea 100644
--- a/pkg/api/oas_response_decoders_gen.go
+++ b/pkg/api/oas_response_decoders_gen.go
@@ -14,7 +14,7 @@ import (
 	"github.com/ogen-go/ogen/validate"
 )
 
-func decodeCreateSubmissionResponse(resp *http.Response) (res *Submission, _ error) {
+func decodeCreateSubmissionResponse(resp *http.Response) (res *ID, _ error) {
 	switch resp.StatusCode {
 	case 200:
 		// Code 200.
@@ -30,7 +30,7 @@ func decodeCreateSubmissionResponse(resp *http.Response) (res *Submission, _ err
 			}
 			d := jx.DecodeBytes(buf)
 
-			var response Submission
+			var response ID
 			if err := func() error {
 				if err := response.Decode(d); err != nil {
 					return err
diff --git a/pkg/api/oas_response_encoders_gen.go b/pkg/api/oas_response_encoders_gen.go
index 3e1e666..e938130 100644
--- a/pkg/api/oas_response_encoders_gen.go
+++ b/pkg/api/oas_response_encoders_gen.go
@@ -13,7 +13,7 @@ import (
 	ht "github.com/ogen-go/ogen/http"
 )
 
-func encodeCreateSubmissionResponse(response *Submission, w http.ResponseWriter, span trace.Span) error {
+func encodeCreateSubmissionResponse(response *ID, w http.ResponseWriter, span trace.Span) error {
 	w.Header().Set("Content-Type", "application/json; charset=utf-8")
 	w.WriteHeader(200)
 	span.SetStatus(codes.Ok, http.StatusText(200))
diff --git a/pkg/api/oas_schemas_gen.go b/pkg/api/oas_schemas_gen.go
index b517dd6..3f84df4 100644
--- a/pkg/api/oas_schemas_gen.go
+++ b/pkg/api/oas_schemas_gen.go
@@ -63,6 +63,21 @@ func (s *ErrorStatusCode) SetResponse(val Error) {
 	s.Response = val
 }
 
+// Ref: #/components/schemas/Id
+type ID struct {
+	ID OptInt64 `json:"ID"`
+}
+
+// GetID returns the value of ID.
+func (s *ID) GetID() OptInt64 {
+	return s.ID
+}
+
+// SetID sets the value of ID.
+func (s *ID) SetID(val OptInt64) {
+	s.ID = val
+}
+
 // NewOptBool returns new OptBool with value set to v.
 func NewOptBool(v bool) OptBool {
 	return OptBool{
diff --git a/pkg/api/oas_server_gen.go b/pkg/api/oas_server_gen.go
index 296f9e2..af27b39 100644
--- a/pkg/api/oas_server_gen.go
+++ b/pkg/api/oas_server_gen.go
@@ -13,7 +13,7 @@ type Handler interface {
 	// Create new submission.
 	//
 	// POST /submissions
-	CreateSubmission(ctx context.Context) (*Submission, error)
+	CreateSubmission(ctx context.Context) (*ID, error)
 	// GetSubmission implements getSubmission operation.
 	//
 	// Retrieve map with ID.
diff --git a/pkg/api/oas_unimplemented_gen.go b/pkg/api/oas_unimplemented_gen.go
index 335d38c..3c6954a 100644
--- a/pkg/api/oas_unimplemented_gen.go
+++ b/pkg/api/oas_unimplemented_gen.go
@@ -18,7 +18,7 @@ var _ Handler = UnimplementedHandler{}
 // Create new submission.
 //
 // POST /submissions
-func (UnimplementedHandler) CreateSubmission(ctx context.Context) (r *Submission, _ error) {
+func (UnimplementedHandler) CreateSubmission(ctx context.Context) (r *ID, _ error) {
 	return r, ht.ErrNotImplemented
 }
 
diff --git a/pkg/service/submissions.go b/pkg/service/submissions.go
index f67c879..7534754 100644
--- a/pkg/service/submissions.go
+++ b/pkg/service/submissions.go
@@ -6,7 +6,7 @@ import (
 )
 
 // POST /submissions
-func (svc *Service) CreateSubmission(ctx context.Context) (*api.Submission, error) {
+func (svc *Service) CreateSubmission(ctx context.Context) (*api.ID, error) {
 	return nil, nil
 }