For using API Interface, what are the pre-requisites out there?

API interface allows site-to-site integration between taxpayer's website and the EWB system. Large taxpayers who generate more than 1000 invoices per day or e-way bills per hour can use API interface. To use API interface, taxpayer must meet the following requirements: * Invoicing system should have IT solutions. 
* He must be able to modify his IT system in order to integrate with EWB according to API guidelines. 
* He should generate at least 1000 invoices/eway bills per day. 
* His system must have an SSL-based domain name.
* His system must have a static IP address.
* He should have a pre-production system for testing the API interface.