There are ways in which you can internationally link your PayPal account and receive money in any currency that you select. I am providing you with a link of an article that explains step by step of what you're required to do to complete the process.
Hope this would be of help to you.
Hi! thank you; but I think I shouldn't be worried about the currencies since the prices in my online store are in USD and my market will be the US, even though I am located in Argentina. My question is if there will be any problem (technical or legal) if my store's address saved in Shopify is in Argentina while I am using a US paypay account with a US bank account (created when I was living in the US).