Vaccination Centres provide for a limited number of on-spot registration slots every day. Citizens aged 45 years and above can schedule appointments online or walk-in to vaccination centres. However, Citizens aged 18-44 years should mandatorily register themselves and schedule appointments online before going to the vaccination centre for a hassle-free vaccination experience. PDF: COVID-19 Vaccine: Getting Started Source: COWIN app https://www.cowin.gov.in/faq