La Manzanilla does not have a bank and only a few businesses accept credit cards or currency other than pesos. There is an ATM in town in the Delegados Office adjacent to the main plaza but it’s not always reliable.
You will best served to arrive with enough Mexican pesos for your stay or plan a trip to Melaque to replenish your stash of cash. Pesos are the currency used in Mexico. Bills come in denominations of $20, $50, $100, $200, $500, and $1,000 pesos. Coins are in denominations of $1, $2, $5, $10, and $20 pesos and 10, 20 and 50 centavos. The exchange rate fluctuates daily.