More than 4,500 holidaymakers have applied for short-term vaccine passports, MLAs have been told.
The so-called COVIDCert was announced by the Department of Health on Friday.
The emergency scheme was introduced by Northern Ireland’s Department of Health to accommodate those planning to visit countries which require proof of two Covid-19 vaccinations.
Health Minister Robin Swann told MLAs the public response had been “incredible”.
He told MLAs 4,500 applications were received by 13:00 BST on Monday, with 125 vaccine passports issued on Sunday for those planning to travel on Monday.
“The short term interim arrangements are only for people travelling to foreign countries who require proof of double-dose vaccination up to 20 July,” Mr Swann said.
“The interim documentation will have a short-term expiry date and will be of no use to