Great question. We accept donations from all over the world and those donations will be processed in US or Canadian dollars. Any campaign you create will adopt the currency of the benefiting charity, and exchange rates will apply to any non-local donors.
As far as any extra fees an international donor will incur, it all depends on their financial institution. Some banks levy a small additional charge to process an international transaction. CrowdRise itself does not charge any extra fees on international donations.
In other words, if a non-Canadian donor places a donation on a Canadian campaign (indicated with a maple leaf next to the donation amount), they will pay the daily exchange rate, and any permissible bank fees. This also applies to non-US donors placing donations on US campaigns.
An international donor will receive a receipt that contains all of the information the US IRS or Candian CRA requires for a donation receipt. Any other questions about the tax information needed for their country of residence will have to be researched by the individual donor.