diff --git a/v2/service/convert.go b/v2/service/convert.go
index 2ced953..eb8a10a 100644
--- a/v2/service/convert.go
+++ b/v2/service/convert.go
@@ -1,6 +1,8 @@
 package service
 
 import (
+	"github.com/nspcc-dev/neofs-api-go/v2/acl"
+	"github.com/nspcc-dev/neofs-api-go/v2/refs"
 	service "github.com/nspcc-dev/neofs-api-go/v2/service/grpc"
 )
 
@@ -67,13 +69,39 @@ func SessionTokenFromGRPCMessage(m *service.SessionToken) *SessionToken {
 }
 
 func BearerTokenToGRPCMessage(t *BearerToken) *service.BearerToken {
-	// TODO: fill me
-	return nil
+	if t == nil {
+		return nil
+	}
+
+	m := new(service.BearerToken)
+
+	m.SetBody(
+		BearerTokenBodyToGRPCMessage(t.GetBody()),
+	)
+
+	m.SetSignature(
+		SignatureToGRPCMessage(t.GetSignature()),
+	)
+
+	return m
 }
 
 func BearerTokenFromGRPCMessage(m *service.BearerToken) *BearerToken {
-	// TODO: fill me
-	return nil
+	if m == nil {
+		return nil
+	}
+
+	bt := new(BearerToken)
+
+	bt.SetBody(
+		BearerTokenBodyFromGRPCMessage(m.GetBody()),
+	)
+
+	bt.SetSignature(
+		SignatureFromGRPCMessage(m.GetSignature()),
+	)
+
+	return bt
 }
 
 func RequestVerificationHeaderToGRPCMessage(r *RequestVerificationHeader) *service.RequestVerificationHeader {
@@ -225,3 +253,75 @@ func SignatureFromGRPCMessage(m *service.Signature) *Signature {
 
 	return s
 }
+
+func TokenLifetimeToGRPCMessage(tl *TokenLifetime) *service.TokenLifetime {
+	if tl == nil {
+		return nil
+	}
+
+	m := new(service.TokenLifetime)
+
+	m.SetExp(tl.GetExp())
+	m.SetNbf(tl.GetNbf())
+	m.SetIat(tl.GetIat())
+
+	return m
+}
+
+func TokenLifetimeFromGRPCMessage(m *service.TokenLifetime) *TokenLifetime {
+	if m == nil {
+		return nil
+	}
+
+	tl := new(TokenLifetime)
+
+	tl.SetExp(m.GetExp())
+	tl.SetNbf(m.GetNbf())
+	tl.SetIat(m.GetIat())
+
+	return tl
+}
+
+func BearerTokenBodyToGRPCMessage(v *BearerTokenBody) *service.BearerToken_Body {
+	if v == nil {
+		return nil
+	}
+
+	m := new(service.BearerToken_Body)
+
+	m.SetEaclTable(
+		acl.TableToGRPCMessage(v.GetEACL()),
+	)
+
+	m.SetOwnerId(
+		refs.OwnerIDToGRPCMessage(v.GetOwnerID()),
+	)
+
+	m.SetLifetime(
+		TokenLifetimeToGRPCMessage(v.GetLifetime()),
+	)
+
+	return m
+}
+
+func BearerTokenBodyFromGRPCMessage(m *service.BearerToken_Body) *BearerTokenBody {
+	if m == nil {
+		return nil
+	}
+
+	bt := new(BearerTokenBody)
+
+	bt.SetEACL(
+		acl.TableFromGRPCMessage(m.GetEaclTable()),
+	)
+
+	bt.SetOwnerID(
+		refs.OwnerIDFromGRPCMessage(m.GetOwnerId()),
+	)
+
+	bt.SetLifetime(
+		TokenLifetimeFromGRPCMessage(m.GetLifetime()),
+	)
+
+	return bt
+}
diff --git a/v2/service/service.go b/v2/service/service.go
index 1a1e0a7..a23179b 100644
--- a/v2/service/service.go
+++ b/v2/service/service.go
@@ -1,5 +1,10 @@
 package service
 
+import (
+	"github.com/nspcc-dev/neofs-api-go/v2/acl"
+	"github.com/nspcc-dev/neofs-api-go/v2/refs"
+)
+
 type Signature struct {
 	key, sign []byte
 }
@@ -12,12 +17,26 @@ type XHeader struct {
 	key, val string
 }
 
+type TokenLifetime struct {
+	exp, nbf, iat uint64
+}
+
 type SessionToken struct {
 	// TODO: fill me
 }
 
+type BearerTokenBody struct {
+	eacl *acl.Table
+
+	ownerID *refs.OwnerID
+
+	lifetime *TokenLifetime
+}
+
 type BearerToken struct {
-	// TODO: fill me
+	body *BearerTokenBody
+
+	sig *Signature
 }
 
 type RequestVerificationHeader struct {
@@ -311,3 +330,115 @@ func (r *RequestMetaHeader) StableSize() int {
 	// TODO: do not use hack
 	return RequestMetaHeaderToGRPCMessage(r).Size()
 }
+
+func (tl *TokenLifetime) GetExp() uint64 {
+	if tl != nil {
+		return tl.exp
+	}
+
+	return 0
+}
+
+func (tl *TokenLifetime) SetExp(v uint64) {
+	if tl != nil {
+		tl.exp = v
+	}
+}
+
+func (tl *TokenLifetime) GetNbf() uint64 {
+	if tl != nil {
+		return tl.nbf
+	}
+
+	return 0
+}
+
+func (tl *TokenLifetime) SetNbf(v uint64) {
+	if tl != nil {
+		tl.nbf = v
+	}
+}
+
+func (tl *TokenLifetime) GetIat() uint64 {
+	if tl != nil {
+		return tl.iat
+	}
+
+	return 0
+}
+
+func (tl *TokenLifetime) SetIat(v uint64) {
+	if tl != nil {
+		tl.iat = v
+	}
+}
+
+func (bt *BearerTokenBody) GetEACL() *acl.Table {
+	if bt != nil {
+		return bt.eacl
+	}
+
+	return nil
+}
+
+func (bt *BearerTokenBody) SetEACL(v *acl.Table) {
+	if bt != nil {
+		bt.eacl = v
+	}
+}
+
+func (bt *BearerTokenBody) GetOwnerID() *refs.OwnerID {
+	if bt != nil {
+		return bt.ownerID
+	}
+
+	return nil
+}
+
+func (bt *BearerTokenBody) SetOwnerID(v *refs.OwnerID) {
+	if bt != nil {
+		bt.ownerID = v
+	}
+}
+
+func (bt *BearerTokenBody) GetLifetime() *TokenLifetime {
+	if bt != nil {
+		return bt.lifetime
+	}
+
+	return nil
+}
+
+func (bt *BearerTokenBody) SetLifetime(v *TokenLifetime) {
+	if bt != nil {
+		bt.lifetime = v
+	}
+}
+
+func (bt *BearerToken) GetBody() *BearerTokenBody {
+	if bt != nil {
+		return bt.body
+	}
+
+	return nil
+}
+
+func (bt *BearerToken) SetBody(v *BearerTokenBody) {
+	if bt != nil {
+		bt.body = v
+	}
+}
+
+func (bt *BearerToken) GetSignature() *Signature {
+	if bt != nil {
+		return bt.sig
+	}
+
+	return nil
+}
+
+func (bt *BearerToken) SetSignature(v *Signature) {
+	if bt != nil {
+		bt.sig = v
+	}
+}