Integration with systems of States & CBEC :

Model 1 States

a) All model 1 states will continue to use their own IT systems. However they will have to augment their system to receive and transmit data from/to GST system based on web services (open APIs). The APIs are being provided by
the GSTN to States/CBEC for various transactional activities, specific reports etc.

b) As an illustration, when a Taxpayer files Registration data in GST system, the registration information along with uploaded scanned documents are transmitted to the respective State’s IT system as well as CBEC’s IT system. In case of any additional information requirement, state/CBEC official updates the same in their system, which is pushed to GST system as status update to the tax payer. In case, Registration is approved or rejected, the status is
transmitted to GST system through open Web Services. Thus, Tax payer is able to check Registration status anytime on GST portal.

c) In the same manner, returns, payments etc. information shall also be transmitted to respective state on continuous basis and they will be able to process the information as per their own processes, thus ensuring autonomy of state side IT system for Model 1 states.

Model 2 States

For model 2 states (presently 19 in nos. List as per annexure-I), GSTN will develop standard backend modules as per list below:
a. Approval of Dealer Registration
b. Return Processing & Payment
c. Refundd.

d.Audit
e. Assessment
f. Appeal and Revision
g. Recovery and Write-off/DCR
h. Enforcement and Survey
i. MIS/Reports
j. Advance ruling
k. Policy and administration
l. Prosecution

All these backend modules shall be hosted in the same data center as GST system, however on separate servers, storage etc. The tax officials of Model 2 shall access these backend modules for their various administrative needs over dedicated MPLS network links provided by GSTN for the purpose. Thus Model 2 states need not provide any servers, storage or applications etc. for GST operations. However, Model-2 States will have to assess and maintain the adequacy of their IT systems at their end in terms of the following:

• End Points (Desktops, Laptops etc.)

• Network and Security devices in their internal network (LAN etc.)

• Network Links and their capacity in their WAN (State WAN etc.)

• Information Security (Anti-Malware, Malicious Content filtering etc.)

• User ID and Password management

• Existing IT Systems of VAT/Service Tax/Excise