The Visa application process for Tonga is pretty simple and you can get the visa without wasting much time. For this, you are required to submit certain documents listed –
A passport having a minimum of six months validity beyond the decided stay and two blank pages in the passport.
Two scanned current colored photographs.
A confirmed return flight ticket.
Invitation letter.
Updated bank statement for the last three months.
For a business visa, you have to present an invitation letter from the company.
Birth certificate if a child is traveling with you.