Add order items

internal/entities/payment_order_item.go

@@ -11,6 +11,7 @@ type PaymentOrderItem struct {
 	ID          uuid.UUID `gorm:"type:uuid;primary_key;default:gen_random_uuid()" json:"id"`
 	PaymentID   uuid.UUID `gorm:"type:uuid;not null;index" json:"payment_id"`
 	OrderItemID uuid.UUID `gorm:"type:uuid;not null;index" json:"order_item_id"`
+	Quantity    int       `gorm:"not null;default:0" json:"quantity"` // Quantity paid for this specific payment
 	Amount      float64   `gorm:"type:decimal(10,2);not null" json:"amount"`
 	CreatedAt   time.Time `gorm:"autoCreateTime" json:"created_at"`
 	UpdatedAt   time.Time `gorm:"autoUpdateTime" json:"updated_at"`