diff --git a/main_test.go b/main_test.go
index b6afe0f..aee436e 100644
--- a/main_test.go
+++ b/main_test.go
@@ -3,6 +3,7 @@ package main
 import (
 	"bytes"
 	"encoding/json"
+	"github.com/google/uuid"
 	"github.com/stretchr/testify/assert"
 	"go-nkode/core/api"
 	m "go-nkode/core/model"
@@ -25,7 +26,7 @@ func TestApi(t *testing.T) {
 
 	username := m.Username("test_username")
 	signupInterfaceBody := m.GenerateSignupInterfacePost{
-		CustomerId:  customerResp.CustomerId,
+		CustomerId:  uuid.UUID(customerResp.CustomerId),
 		AttrsPerKey: kp.AttrsPerKey,
 		NumbOfKeys:  kp.NumbOfKeys,
 		Username:    username,
@@ -40,8 +41,8 @@ func TestApi(t *testing.T) {
 	setKeySelection, err := m.SelectKeyByAttrIdx(setInterface, userPasscode, kp_set)
 	assert.NoError(t, err)
 	setNKodeBody := m.SetNKodePost{
-		CustomerId:   customerResp.CustomerId,
-		SessionId:    signupInterfaceResp.SessionId,
+		CustomerId:   uuid.UUID(customerResp.CustomerId),
+		SessionId:    uuid.UUID(signupInterfaceResp.SessionId),
 		KeySelection: setKeySelection,
 	}
 	var setNKodeResp m.SetNKodeResp
@@ -50,14 +51,14 @@ func TestApi(t *testing.T) {
 	confirmKeySelection, err := m.SelectKeyByAttrIdx(confirmInterface, userPasscode, kp_set)
 	assert.NoError(t, err)
 	confirmNKodeBody := m.ConfirmNKodePost{
-		CustomerId:   customerResp.CustomerId,
+		CustomerId:   uuid.UUID(customerResp.CustomerId),
 		KeySelection: confirmKeySelection,
-		SessionId:    signupInterfaceResp.SessionId,
+		SessionId:    uuid.UUID(signupInterfaceResp.SessionId),
 	}
 	testApiPost(t, base+api.ConfirmNKode, confirmNKodeBody, nil)
 
 	loginInterfaceBody := m.GetLoginInterfacePost{
-		CustomerId: customerResp.CustomerId,
+		CustomerId: uuid.UUID(customerResp.CustomerId),
 		Username:   username,
 	}
 
@@ -67,20 +68,20 @@ func TestApi(t *testing.T) {
 	loginKeySelection, err := m.SelectKeyByAttrIdx(loginInterfaceResp.UserIdxInterface, userPasscode, kp)
 	assert.NoError(t, err)
 	loginBody := m.LoginPost{
-		CustomerId:   customerResp.CustomerId,
+		CustomerId:   uuid.UUID(customerResp.CustomerId),
 		Username:     username,
 		KeySelection: loginKeySelection,
 	}
 
 	testApiPost(t, base+api.Login, loginBody, nil)
 
-	renewBody := m.RenewAttributesPost{CustomerId: customerResp.CustomerId}
+	renewBody := m.RenewAttributesPost{CustomerId: uuid.UUID(customerResp.CustomerId)}
 	testApiPost(t, base+api.RenewAttributes, renewBody, nil)
 
 	loginKeySelection, err = m.SelectKeyByAttrIdx(loginInterfaceResp.UserIdxInterface, userPasscode, kp)
 	assert.NoError(t, err)
 	loginBody = m.LoginPost{
-		CustomerId:   customerResp.CustomerId,
+		CustomerId:   uuid.UUID(customerResp.CustomerId),
 		Username:     username,
 		KeySelection: loginKeySelection,
 	}