1) Under international law, a state does not have any obligation to surrender an alleged criminal to a foreign state.
2) Pakistan and India have not signed any extradition treaty.
3) Masood Azhar is a Pakistani citizen, and while the law of Pakistan, unlike the law of many other countries, allows extradition of Pakistani citizens to foreign states even when no extradition treaty is in place with that country, such an extradition is subject to due observance of the provisions of the Constitution, the Extradition Act, 1972 and other laws of the country.
4) When a foreign state submits a formal requisition to the Federal Government of Pakistan for the surrender of a fugitive offender through its diplomatic representative in Pakistan (or through Pakistan’s diplomatic representative in such foreign state), the Federal Government of Pakistan, if it thinks fit, orders an inquiry into such matter that is to be conducted by a First Class Magistrate who then takes evidence in support of the requisition for surrender. An inquiry (but not a trial) is conducted and report is submitted to the Federal Government which has the final authority to issue a warrant for delivery of the fugitive offender to the requisitioning foreign state or simply refuse, if the government believes that it would be unjust or inexpedient to surrender the fugitive offender as the requisition for surrender has not been made in good faith or in the interest of justice.
5) India has never sent out any official extradition request to Pakistan. All this rona dhona is just political rhetoric.