I think they would either need to set up a PayPal account or use the one time trial PayPal offers that let's people send money using their email without setting up an account, just know that they can only do that once with any given email and will have to finish setting up an account after that to use it with PayPal again. As far as the currency, the way I understand it they can pay you in their currency and if you include it as a currency you accept in PayPal it will sit in your account as "Paesos" and you can eith use it that way or convert it to the currency of your choice. Just be aware of any value diffrences and make sure you aren't eating that. I think this is why the suggestion you have them convert it when sending, they can elect to absorb any diffrence or fees just like they can elect to absorb any cc or merchant fees too. Hope that helps.
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