diff --git a/codec_test.go b/codec_test.go
index f1beaab..f110667 100644
--- a/codec_test.go
+++ b/codec_test.go
@@ -3,8 +3,40 @@ package toml
 import (
 	"bytes"
 	"testing"
+
+	"github.com/unistack-org/micro/v3/codec"
 )
 
+func TestFrame(t *testing.T) {
+	s := &codec.Frame{Data: []byte("test")}
+
+	buf, err := NewCodec().Marshal(s)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !bytes.Equal(buf, []byte(`test`)) {
+		t.Fatalf("bytes not equal %s != %s", buf, `test`)
+	}
+}
+
+func TestFrameFlatten(t *testing.T) {
+	s := &struct {
+		One  string
+		Name *codec.Frame `toml:"name" codec:"flatten"`
+	}{
+		One:  "xx",
+		Name: &codec.Frame{Data: []byte("test")},
+	}
+
+	buf, err := NewCodec().Marshal(s)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !bytes.Equal(buf, []byte(`test`)) {
+		t.Fatalf("bytes not equal %s != %s", buf, `test`)
+	}
+}
+
 func TestReadBody(t *testing.T) {
 	s := &struct {
 		Name string
diff --git a/go.mod b/go.mod
index aa8cc58..1af1910 100644
--- a/go.mod
+++ b/go.mod
@@ -4,5 +4,5 @@ go 1.16
 
 require (
 	github.com/BurntSushi/toml v0.4.1
-	github.com/unistack-org/micro/v3 v3.7.1
+	github.com/unistack-org/micro/v3 v3.7.4
 )
diff --git a/go.sum b/go.sum
index 0277fd5..d8c825c 100644
--- a/go.sum
+++ b/go.sum
@@ -1,6 +1,5 @@
 github.com/BurntSushi/toml v0.4.1 h1:GaI7EiDXDRfa8VshkTj7Fym7ha+y8/XxIgD2okUIjLw=
 github.com/BurntSushi/toml v0.4.1/go.mod h1:CxXYINrC8qIiEnFrOxCa7Jy5BFHlXnUU2pbicEuybxQ=
-github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/ef-ds/deque v1.0.4/go.mod h1:gXDnTC3yqvBcHbq2lcExjtAcVrOnJCbMcZXmuj8Z4tg=
 github.com/golang-jwt/jwt/v4 v4.0.0/go.mod h1:/xlHOz8bRuivTWchD4jCa+NbatV+wEUSzwAxVc6locg=
 github.com/golang/protobuf v1.5.0/go.mod h1:FsONVRAS9T7sI+LIUmWTfcYkHO4aIWwzhcaSAoJOfIk=
@@ -8,14 +7,11 @@ github.com/google/go-cmp v0.5.5 h1:Khx7svrCpmxxtHBq5j2mp/xVjsi8hQMfNLvJFAlrGgU=
 github.com/google/go-cmp v0.5.5/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
 github.com/imdario/mergo v0.3.12/go.mod h1:jmQim1M+e3UYxmgPu/WyfjB3N3VflVyUjjjwH0dnCYA=
 github.com/patrickmn/go-cache v2.1.0+incompatible/go.mod h1:3Qf8kWWT7OJRJbdiICTKqZju1ZixQ/KpMGzzAfe6+WQ=
-github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/silas/dag v0.0.0-20210121180416-41cf55125c34/go.mod h1:7RTUFBdIRC9nZ7/3RyRNH1bdqIShrDejd1YbLwgPS+I=
-github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
-github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
 github.com/unistack-org/micro-proto v0.0.9 h1:KrWLS4FUX7UAWNAilQf70uad6ZPf/0EudeddCXllRVc=
 github.com/unistack-org/micro-proto v0.0.9/go.mod h1:Cckwmzd89gvS7ThxzZp9kQR/EOdksFQcsTAtDDyKwrg=
-github.com/unistack-org/micro/v3 v3.7.1 h1:gjCon1U8i9upNgw9+iEgbZh2LCeBizDYotQ+THHV0lo=
-github.com/unistack-org/micro/v3 v3.7.1/go.mod h1:gBoY6gvzeFiJTZ4FgDttGNSs4Y1+1PRg2cV1yTRMSlg=
+github.com/unistack-org/micro/v3 v3.7.4 h1:nRk7f58v0VsiW7aKL0UQaFCQxFoursHQLoWdeZ1RYbg=
+github.com/unistack-org/micro/v3 v3.7.4/go.mod h1:78vy7ggElJD+ayx8ruhJsY+SkGUupfR32LXrg1UObvg=
 golang.org/x/net v0.0.0-20210510120150-4163338589ed/go.mod h1:9nx3DQGgdP8bBQD5qxJ1jj9UTztislL4KSBs9R2vV5Y=
 golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20210423082822-04245dca01da/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
@@ -29,4 +25,3 @@ google.golang.org/protobuf v1.27.1 h1:SnqbnDw1V7RiZcXPx5MEeqPv2s79L9i7BJUlG/+Rur
 google.golang.org/protobuf v1.27.1/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQnmE0givc=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/yaml.v2 v2.3.0/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
-gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
diff --git a/toml.go b/toml.go
index 2baad4f..fb6b6af 100644
--- a/toml.go
+++ b/toml.go
@@ -10,49 +10,63 @@ import (
 	rutil "github.com/unistack-org/micro/v3/util/reflect"
 )
 
-type tomlCodec struct{}
+type tomlCodec struct {
+	opts codec.Options
+}
+
+var _ codec.Codec = &tomlCodec{}
 
 const (
 	flattenTag = "flatten"
 )
 
-func (c *tomlCodec) Marshal(v interface{}) ([]byte, error) {
-	switch m := v.(type) {
-	case nil:
+func (c *tomlCodec) Marshal(v interface{}, opts ...codec.Option) ([]byte, error) {
+	if v == nil {
 		return nil, nil
-	case *codec.Frame:
+	}
+
+	options := c.opts
+	for _, o := range opts {
+		o(&options)
+	}
+
+	if nv, nerr := rutil.StructFieldByTag(v, options.TagName, flattenTag); nerr == nil {
+		v = nv
+	}
+
+	if m, ok := v.(*codec.Frame); ok {
 		return m.Data, nil
 	}
 
 	buf := bytes.NewBuffer(nil)
-	defer buf.Reset()
-
-	if nv, nerr := rutil.StructFieldByTag(v, codec.DefaultTagName, flattenTag); nerr == nil {
-		v = nv
-	}
-
 	err := toml.NewEncoder(buf).Encode(v)
 	if err != nil {
 		return nil, err
 	}
+
 	return buf.Bytes(), nil
 }
 
-func (c *tomlCodec) Unmarshal(b []byte, v interface{}) error {
-	if len(b) == 0 || v == nil {
+func (c *tomlCodec) Unmarshal(d []byte, v interface{}, opts ...codec.Option) error {
+	if v == nil || len(d) == 0 {
 		return nil
 	}
 
-	if m, ok := v.(*codec.Frame); ok {
-		m.Data = b
-		return nil
+	options := c.opts
+	for _, o := range opts {
+		o(&options)
 	}
 
-	if nv, nerr := rutil.StructFieldByTag(v, codec.DefaultTagName, flattenTag); nerr == nil {
+	if nv, nerr := rutil.StructFieldByTag(v, options.TagName, flattenTag); nerr == nil {
 		v = nv
 	}
 
-	return toml.Unmarshal(b, v)
+	if m, ok := v.(*codec.Frame); ok {
+		m.Data = d
+		return nil
+	}
+
+	return toml.Unmarshal(d, v)
 }
 
 func (c *tomlCodec) ReadHeader(conn io.Reader, m *codec.Message, t codec.MessageType) error {
@@ -92,6 +106,6 @@ func (c *tomlCodec) String() string {
 	return "toml"
 }
 
-func NewCodec() codec.Codec {
-	return &tomlCodec{}
+func NewCodec(opts ...codec.Option) *tomlCodec {
+	return &tomlCodec{opts: codec.NewOptions(opts...)}
 }