Changing visa facts should be traceable to an official source, a review date and an accountable reviewer. Marketing copy is not treated as legal evidence.
Source hierarchy
- Vietnamese laws, resolutions and official government documents.
- The Vietnam National Electronic Visa system and Immigration Department guidance.
- Vietnamese embassy or consulate guidance for jurisdiction-specific procedures.
- Operational experience, clearly labelled when it is not an official rule.
Review and correction process
Validity, fees, processing guidance, entry gates and in-country status are checked more frequently than evergreen content. Material changes are propagated across active languages from one controlled fact source. When a conflict is found, we preserve the source, correct the affected pages, update the review date and avoid silently strengthening the claim.