I personally very fond of Karachi cookies.These are worth trying specially Osmania.There are so many outlets in Hyderabad. I dont know about there online services.
Once I visited Kalyani Nagar outlet. There are so many products available besides cookies.Price was also reasonable. There was also a small cafe insode the store although it was under renovation.Both payment methods are available( cash and card) . Staffs are helpful.You will find them at every corner.They will suggest you the best.