1. The three lines
Certification: the commercial document is genuine.
Authentication: the signature of the certifying official is genuine, and the document has not changed since.
Legalisation: the destination recognises the preceding steps.
2. The first line, in practice
The document is what it says it is. The exporter’s seal is genuine.
Without it, the chain has nothing to vouch for.
3. The second line, in practice
Customs and tariff matters are the exporter’s concern. The document has to be correct before certification means anything.
An error in the invoice is an error in the certified invoice, and certification does not cure it.
4. The third line, in practice
The destination’s customs administration decides what it will accept.
It may accept the certificate of origin without commercial certification.
It may require both.
5. The point that is commonly missed
The chain is cumulative. Each step adds assurance.
A missing step is not compensated by a later document, and cannot be substituted after the fact without starting over.
6. What to do when the destination’s requirement is unclear
Ask the importer for the customs document, not the summary.
The customs document names the forms and the authorities.
7. A working record
For each market: the required documents, the required certifications, and the authorities involved.
The three-column record eliminates most questions.
8. Closing view
The three lines are not three options. They answer three different questions, and all three questions have to be answered.
*This article is based on China’s consular authentication regulations, updated October 2026, and CCPIT certification practice.*