The government has a tourist visa system with three different categories:
I. Visa-On-Arrival (VOA)
The Pay for Visa-On-arrival (VOA) system applies for citizens of certain nations.
Please visit the Indonesian Embassy website for your country, to see the full list of nations and which international gateways you can require the visa from.
The cost of the 30-day (only) tourist visa is US$35/person for a 30-day visa and US$10/person for a 3-day visa. The fee must be paid in cash (no credit cards) on arrival at the airport.
Visitors from countries with visa-on-arrival facility will have to go to a special counter to have their passports stamped with the on-arrival visa before going to the immigration clearance desk. The VOA visa is NOT EXTENDABLE OR RENEWABLE. A visa issued on arrival can be extended only in extraordinary circumstances such as natural disasters, accident, or illness. If you want to stay in Indonesia longer than the 30 days you must exit and re-enter the country on a new tourist visa.
Visa purchasing takes 15-30 minutes per applicant, depending on the number of persons applying. Payment counters, a bank counter, and a money changer have been set up to process payments. Passport must be valid for at least six months from the date of arrival. Payment must be made on arrival. An onward or return trip ticket must be shown on arrival.
Source : Ministry of Culture and Tourism, Republic of Indonesia