Here are some important links:

Canada Revenue Agency’s main site http://www.cra-arc.gc.ca/menu-eng.html

Canada Revenue Agency’s site for GST Information http://www.cra-arc.gc.ca/gsthst/

Canada Revenue Agency’s Syria Emergency Relief Fund – http://www.international.gc.ca/development-developpement/humanitarian_response-situations_crises/fund_syria-syrie_fonds.aspx?lang=eng