The Enforcement Rules of the Conclusion of Treaties Act Article 2

The institutions and organizations authorized by the competent administrative authorities of the central government referred to in Article 2 of the Act mean diplomatic missions established in countries that do not have official diplomatic ties with the Republic of China, or institutions or organizations authorized by law to assist international affairs, except for institutions or organizations that are designated by the Ministry of Foreign Affairs (hereinafter referred to as “MOFA”) to assist special cases resulting from diplomatic circumstances.The international organizations referred to in Article 2 of the Act mean international inter-governmental organizations.The foreign institutions and organizations authorized by their government referred to in Article 2 of the Act mean organizations or representative institutions that are established in the Republic of China by the central government of foreign countries that do not have official diplomatic ties with the Republic of China, to assist diplomatic, consular, cultural, and commercial affairs of the Republic of China, except for institutions or organizations that are designated by MOFA to assist special cases resulting from diplomatic circumstances.
中文原文 條約締結法施行細則第2條
本法第二條所稱中央行政機關授權之機構、團體,指我國政府於無邦交國家設置之駐外機構或依法令授權委託處理涉外事務之機構或團體。
但因外交情勢所必要之特殊情況,經外交部指定者,不在此限。
本法第二條所稱國際組織,指政府間國際組織。
本法第二條所稱外國政府授權之機構、團體,指無邦交國家中央政府為處理與我國之外交、領事或文化商務等事務而設置之組織或於我國設置之代表機構。
但因外交情勢所必要之特殊情況,經外國中央政府指定者,不在此限。

English translation for reference only; the Chinese text prevails. Not legal advice.