Travelers need a QR Code to enter Dominican Republic, which is generated through the government's e-Ticket platform. This system makes entering the Dominican Republic easier by combining customs, immigration, and health forms into one QR Code. Travelers show this code at the security check-ins when they arrive.
Before, the earliest you could apply for your eTicket was 72 hours before your travel date. This regulation has since changed; the eTicket can be filled out as soon as you have your flight information, even months in advance. There's no specified expiration time for the QR code once it has been generated.
Passports and visa: U.S. citizens must have a valid U.S. passport to enter Dominica. No visa is required for stays less than 6 months if you have an onward or return ticket, confirmation of accommodation, and can produce evidence of your ability to maintain yourself.