Does Visa-on-Arrival mean I can just show up?

Yes, but only if your passport is valid and you meet all entry requirements. If you have a criminal record or lack proof of funds, you may still be denied.

Can I pay with a credit card at the border?

Rarely. Always assume you must pay in cash. If a card machine exists, it is often offline or adds a 5-10% surcharge.

How to Navigate Visa-on-Arrival Countries for Backpackers

Visa-on-arrival (VOA) allows you to pay a fee and receive entry permission at the border or airport without prior application. You must have a passport with six months of validity, sufficient cash for the visa fee, and at least two blank pages.

Verify your passport status. Ensure your passport has at least six months of validity remaining from your date of entry. Immigration officials will deny entry if it expires sooner.
Carry crisp, new US dollars. Many countries (like Indonesia or Cambodia) prefer crisp, unmarked, and recent-issue USD bills for visa fees. Old, torn, or marked bills are often rejected at the immigration counter.
Prepare your digital photos. Carry two 2x2 inch (5x5 cm) passport-style photos. While some airports have machines, they are often broken or overpriced. Having your own saves 15 minutes of hassle.
Bring proof of onward travel. Print your flight or bus reservation out of the country. Immigration officers often ask for this to ensure you aren't planning to overstay your tourist visa.

Does Visa-on-Arrival mean I can just show up?: Yes, but only if your passport is valid and you meet all entry requirements. If you have a criminal record or lack proof of funds, you may still be denied.
Can I pay with a credit card at the border?: Rarely. Always assume you must pay in cash. If a card machine exists, it is often offline or adds a 5-10% surcharge.