Certification or Licensing
Hinduism is a highly decentralized religion, and there is no standard certification or licensing for purohits. Organizations such as Arya Pratinidhi Sabha America, which represents Arya Samajs and Vedic Temples in North America, offer certification to members of their sects.
Other Requirements
In the past, Hindu priests typically hailed from the Brahmin caste, but today, they can come from any caste provided that they have requisite training and that the governing Agama Shastras (temple rules) allow it.