24 HR stay visa for a Guatemala passport

I have a Guatemalan Passport and have a 13 hour layover in Beijing ( Final destination is Japan). Does the 24Hr free visa stay applies to me? do I need to fill out paperwork? if so, where? once arriving to the airport? To the airline? is a bit confusing since the explanation is for the 72-Hr free transitwhich does not apply to me and my country is not one of those exempt from the visa. Anyone? thanks.