diff --git a/internal/models/opt.go b/internal/models/opt.go
new file mode 100644
index 0000000..f1b6a6f
--- /dev/null
+++ b/internal/models/opt.go
@@ -0,0 +1,47 @@
+package models
+
+import (
+	"github.com/google/uuid"
+	"gorm.io/gorm"
+)
+
+func (u *OTP) BeforeCreate(tx *gorm.DB) error {
+
+	uuid := uuid.New().String()
+	OTP := "should be Random six digit number"
+
+	tx.Statement.SetColumn("ID", uuid)
+	tx.Statement.SetColumn("OPT", OTP)
+	return nil
+}
+
+func (u *OTP) Create(opt OTP) (string, error) {
+
+	// Expire all other existing user opts
+	result := db.Create(&opt)
+
+	if result.Error != nil {
+		return "", result.Error
+	}
+	return opt.ID, nil
+}
+
+func (u *OTP) FindOne(id string) (OTP, error) {
+	var opt OTP
+	db.First(&opt, "id = ?", id)
+
+	return opt, nil
+}
+
+func (u *OTP) FindByUser(userId string) (OTP, error) {
+	var otp OTP
+	db.First(&otp, "userId = ?", userId)
+
+	return otp, nil
+}
+
+func (u *OTP) ExpireUserOPT(userId string) error {
+
+	//TODO: to expire opt here
+	return nil
+}
diff --git a/internal/models/schema.go b/internal/models/schema.go
index 00365fb..e183e7d 100644
--- a/internal/models/schema.go
+++ b/internal/models/schema.go
@@ -22,7 +22,7 @@ type User struct {
 	Role                   string         `gorm:"column:role;default:'user';not null" json:"role"`
 	App                    []App          `gorm:"constraint:OnUpdate:CASCADE,OnDelete:SET NULL;" json:"apps"`
 	Feedback               []Feedback     `gorm:"constraint:OnUpdate:CASCADE,OnDelete:SET NULL;" json:"feedbacks"`
-	OPT                    []OPT          `gorm:"constraint:OnUpdate:CASCADE,OnDelete:SET NULL;" json:"OPT"`
+	OPT                    []OTP          `gorm:"constraint:OnUpdate:CASCADE,OnDelete:SET NULL;" json:"OPT"`
 	CreatedAt              time.Time      `gorm:"column:createdAt" json:"createdAt"`
 	UpdatedAt              time.Time      `gorm:"column:updatedAt" json:"updatedAt"`
 	DeletedAt              gorm.DeletedAt `gorm:"column:deletedAt;index" json:"deletedAt"`
@@ -73,10 +73,11 @@ type Feedback struct {
 	UpdatedAt time.Time `gorm:"column:updatedAt;index" json:"updatedAt"`
 }
 
-type OPT struct {
+type OTP struct {
 	ID        string    `gorm:"column:id;type:uuid;primaryKey" json:"id"`
 	UserID    string    `gorm:"column:userId;not null;index" json:"userId"`
-	OPT       string    `gorm:"column:OPT;index" json:"OPT"`
+	OTP       int       `gorm:"column:OTP;index" json:"OTP"`
+	IsUsed    bool      `gorm:"column:isUsed;default:false" json:"isUsed"`
 	ExpiresAt time.Time `gorm:"column:expiresAt;not null;index" json:"expiresAt"`
 	CreatedAt time.Time `gorm:"column:createdAt" json:"createdAt"`
 	UpdatedAt time.Time `gorm:"column:updatedAt" json:"updatedAt"`