As far, as I know two main documents are food safety clearance and certificate of origin. In the USA the Prior Notice of imported Cocoa is required to be filed before the arrival of the product. In the United States, FDA (Food and Drug Administration) is responsible for the import of such products.
This is more info for you http://www.nepc.gov.ng/page_export_information.html and the documents are
Sanitary & Phytosanitary (SPS) Issues
Traceability
Global Gap
HACCP (Hazard Analysis & Critical Control Point)
Maximum Residue Level (MRL) for pesticide (how much pesticide residue a product can safely contain.
Other quality and regulation related documents
Registration as an Exporter with NEPC
Clean Report of finding issued by Colbalt International Services Ltd ( Appointed Inspection Agency for Pre- Export Shipment in Nigeria,
Nigeria Custom Services for Single Goods Declaration (SGD),
SON for manufactured products,
NAFDAC for Foods and Drugs
National Plant Quarantine Services for Plant materials ( Phytosanitary certificate),
Federal Produce Inspection services for Agric commodities and
Some private assayers such as SGS
NACCIMA – Certificate of origin