Technology company Tungsten Corporation has said it has received approval to deliver electronics invoices in India, as the group looks to expand its business.The AIM-listed company, which operates the world's largest compliant electronic invoice network, the so-called Tungsten network, hailed the news as a major step forward, describing India as a country with th potential to be one of its largest global markets."Due to the legislative changes made, Tungsten will now be able to offer customers in India an e-Invoicing and e-archiving service similar to those we provide in the EU and the rest of the world," said group chief executive Edmund Truell."Tungsten expects to receive full e-Invoicing compliance in India in the coming months."The firm added that the Indian government its tax law system meaning that, from the beginning of March, customers have been able to sign using a digital signature for all domestic invoices for services.Tungsten shares were up 5.52% to 188.62p at 10:48 on Wednesday.