These include certificates under preferential trade agreements, such as:
GSP Form A: For Generalized System of Preferences treatment from most developed countries (39 listed countries, excluding the USA).
Form B: For the Asia-Pacific Trade Agreement (APTA) members (China, India, Sri Lanka, Bangladesh, Laos, South Korea).
Form E: For the China-ASEAN Free Trade Area (ASEAN members).
Form P: For the China-Pakistan Free Trade Area.
Form F: For the China-Chile Free Trade Area.
Form N: For the China-New Zealand Free Trade Area.
Form X: For the China-Singapore Free Trade Agreement.
Form S: For the China-Switzerland Free Trade Agreement.
China-Peru FTA Certificate
Form L: For the China-Costa Rica Free Trade Area.
Form K: For the China-Korea Free Trade Agreement.
(Note: Preferential COs like Form P, F, N, X, S, etc., are reciprocal, unlike the unilateral GSP Form A.)
These are usually issued by local Entry-Exit Inspection and Quarantine authorities.