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You don't need a transit visa as a Nicaraguan transiting Shanghai Pudong en route to Taipei:
/ 14APR16 / 1550 UTCNational Nicaragua (NI)
Transit China (People's Rep.) (CN)
Destination Chinese Taipei (TW)
China (People's Rep.) (CN)
TWOV (Transit Without Visa):
Visa required, except for Holders of confirmed onward airline tickets for a max. transit time of 24 hours
Source: Timaticweb
The same holds for travel in the opposite direction: Timaticweb reference