If the Ireland nationals is holding a valid visa of U.S.A, Canada or a Schenghen nation he does not require any visa to stay up to 30 days.
Please note that you have to carry all the documents which would justify the purpose of your visit.
Unfortunately, at this time VisaHQ does not provide service for tourist visas to Nicaragua.
Additional steps you may take:Check the current validity of your passport and the availability of blank visa pages
Contact the nearest embassy or consulate of Nicaragua
Take advantage of our extensive embassy and consular database to find the nearest one. Upon contacting the embassy confirm the required documents, the time it takes to process the visa and whether the consulate accepts applications by mail.