cash sale more than 50000/-

GST law you need to issue invoice for every transaction. however in the case of deal with unregistered dealer and amount of invoice is less than rupees 200 then then you don't need to issue invoice for that unless unregistered person insist for it . however in this case you need to issue a single invoice for all day this kind of transaction and you need to account as invoice method because it will it will have more control on your business and you can save from GST department in future