If your account is Argentinian, you can pay directly with Argentinian Pesos or use your balance in crypto to do so. If you're only traveling in Argentina, you can only pay using crypto, not with pesos.
Payments are available in Bitcoin, Ether, DAI, and Digital Dollars, which will be converted into ARS. The other person or store will always receive ARS.
You can learn more about conversions for payments: How is the conversion from crypto to ARS made?