International Extradition: A Guide to U.S. and International Practice

 https://www.arnoldporter.com/en/perspectives/publications/2020/11/international-extradition-a-guide

Extradition treaties are intended to operate like contracts and obligate the parties to arrest and surrender a person to a foreign treaty partner upon request, provided that the treaty's requirements are met and no exceptions apply. Extradition treaties are individually negotiated and may vary in order to accommodate the legal systems and priorities of the negotiating countries, but they generally share common elements. They establish requirements for both the country sending the extradition request (the "requesting state") and the country receiving the request (the "requested state").