The GSTIN Number is structured in a format where the first two digits of 15 digits refer to the State code of Registered individuals. The next ten digits of the GSTIN number are the PAN card numbers of the Registered Individual. The following number is the Entity number of the same PAN; after that digit is an alphabet Z without a default. The last digit is either an alphabet or a numeric digit used to detect errors. GST encompasses former central taxes like Central excise duty, Services taxes, and Customs duties, along with State taxes like Octroi, VAT, Purchase Taxes, and Luxury Taxes. As of now, there are three types of GST which are CGST ( Central Goods and Service Tax), IGST (Integrated Good and Service Tax), and SGST (State Goods and Service Tax) in India. To get gst apply online, read on.