Presently registered person generates invoices from his IT system and logs into EWB system and enters e-way bill details and generate e-way bills. Here, the taxpayer has to make double entries – once for Invoice generation in his system and second time for e-way bill generation. He can integrate his system with EWB system through API. The EWB details are sent from taxpayer system to e-Way bill system through APIs and generation of e-way bill happens at e-Way bill system instantaneously. The eWay bill data is send back to the taxpayer system by the e-Way bill system so that EWB data can be stored in the taxpayers system itself. This will lead saving of manpower and cost of operator for this purpose. Secondly API interface will eliminate data entry mistakes/errors being made by operator. It also saves time. Thirdly e-way bill number can be stored by the taxpayer system in his database with the corresponding invoice. Even in the invoice itself, EWB number can be printed so that printout of EWB need not be taken out and carried out along with the vehicle, separately.