What is?Export Agency?Proof number? What forms are recognized by customs?

The export agency certificate number is a 13-digit code issued by customs (e.g., 5312202500123). The current system in 2025 includes three statutory forms:

• Paper-based certificate: The document must bear the official seal of the agency company and the customs inspection seal.
• Electronic version certificate: The PDF encrypted file downloaded through the Single Window for International Trade
• Data association proof: Electronically generated vouchers automatically bound to the customs declaration number (added by Announcement No. 79 of the General Administration of Customs in 2023)

II. How to Check the Validity of an Export Agency Certificate Number?

Three verification methods available in 2025:

• Single Window System Verification:
  • Log in to the China International Trade Single Window
  • Enter the "Customs Clearance Data Query" module
  • Please enter the 13-digit certificate number and the enterprise credit code.
• Verify on the official website of the General Administration of Customs: Monthly Updated List of Valid Certification Numbers for Public Announcement
• Third-party certification platform inquiry: Verification services provided by financial institutions such as Sinosure.

3. How long is the validity period of the certification number? Are there any new changes in 2025?

According to the latest regulations from the General Administration of Customs in 2025:

• Regular goods: Valid for 180 days from the date of issuance.
• Goods in Special Customs Surveillance Zones: The validity period is shortened to 90 days.
• Dangerous goods: Must complete customs clearance within 30 days (Revised Edition of Hazardous Chemicals Management Regulations 2024)

IV. How to remedy an incorrect agent certification number on the customs declaration form?

It should be handled on a case-by-case basis:

• Errors discovered before customs declaration:
  • Contact the customs at the place of declaration immediately to apply for data withdrawal.
  • When resubmitting, indicate "Amended Declaration" in the remarks column.
• The goods were found to be incorrect after being released.:
  • Submit the "Statement of Circumstances" and original supporting documents to Customs.
  • Apply for data correction through the "Customs Affairs Contact Form" system.
  • For cases involving tax refunds, the tax authorities must be notified simultaneously.

5. How to prevent the risk of certificate numbers when entrusting an agent for export?

It is recommended to take the following measures:

• Select an AEO-certified agency company：The error rate of customs-certified enterprises is 37% lower than the industry average.
• Clarify responsibility allocation: The contract stipulates the data verification process and time limit.
• Establish a dual verification mechanism.：Enterprises conduct secondary verification on the Single Window platform independently.
• Keep communication records: All proof number handovers must be confirmed in writing.

6. What is the relationship between the certificate number and the customs declaration number? How can they be cross-referenced for inquiry?

By 2025, the customs system has achieved automatic binding of the two numbers:

• Enter any number in the "Customs Data Query" interface of the Single Window.
• The system will display the complete associated data chain, including:
  • Customs declaration status
  • Cargo release time
  • Tax refund associated records

VII. What remedial measures are available when the agent certification number becomes invalid?

There are two processing scenarios:

• Not exceeding the claim time limit:
  • Apply for an extension (up to 30 days) from the original issuing customs office.
  • Submit the certificate of non-shipment of goods and the agency agreement.
• The claim period has expired.:
  • A new certificate number needs to be reapplied for.
  • The original certificate number is invalid and cancellation procedures must be completed.
  • For data involving declared information, a data change is required.

8. How to prove the authenticity of the agency relationship during customs inspection?

It is recommended to prepare three sets of supporting documents:

• Basic documents: Original notarized power of attorney
• Fund Certificate: Agency fee payment records and invoices
• Operation log: Cargo Handover Note, Transport Authorization Letter, etc.