Customs APIs

What are customs APIs? Definition

Customs APIs (Application Programming Interfaces) are technical interfaces that allow different IT systems to automatically exchange data within the framework of customs operations. They particularly facilitate the interconnection between economic operators’ software, customs clearance systems, and customs authorities’ information systems.

Customs APIs operate on the principle of structured and programmed communication: they allow an IT system to query, transmit, or receive customs data without manual intervention, according to standardised technical protocols. The customs API automates the exchange of data between the various actors in the logistics and customs chain, reducing manual entries, transcription errors, and processing times.

Customs data exchanges are based on harmonised data models and standards, notably the World Customs Organization (WCO) Data Model and, within the European Union, the EU Customs Data Model (EUCDM).

Customs APIs form the technical backbone for the dematerialisation of customs formalities.

Context of use

Customs APIs apply to numerous data transmission flows:

• Integration between customs clearance software and business information systems (ERP, WMS, accounting systems)
• Automated transmission of customs declarations to official portals (DELTA IEThe DELTA IE (Import/Export) procedure is the French electronic customs clearance system implemented by the DGDDI. [+] in France, ICS2ICS2 (Import Control System 2) is the European Union’s IT system for transmitting pre-customs clearance declarations for… [+] in the EU)
• Exchange of pre-customs clearance data between logistics providers and declarants
• Interconnection between carriers, freight agents, and customs systems
• Integration of commercial and logistics data for declaration input
• Data flows between international trade platforms and customs systems

Practical challenges

The use of customs APIs involves significant technical and administrative obligations:

• Security and authentication: Customs APIs require enhanced security protocols, mutual authentication, and encryption of transmitted data.
• Data normalisation: Exchanged data must comply with the formats, schemas, and management rules defined by the relevant customs system.
• Technical traceability: Each transaction via API must be recorded and archived, providing a complete audit trail.
• Flow responsibility: Even with automated transmission, the data sender assumes responsibility for its compliance.
• Maintenance and updates: Customs APIs evolve with regulations and require continuous maintenance.
• Complex integration: Implementing customs APIs in an existing IT infrastructure requires technical expertise and project management.
• Availability and continuity: Critical customs APIs must have backup mechanisms.

How do Conex solutions use customs APIs?

Conex solutions integrate API capabilities for interoperability:

• Exposure of secure APIs for data exchange
• Integration with official portals (DELTA IE, ICS2, ECS, EMCS)
• Connection with ERP and logistics systems
• Automated transmission of declarations
• Traceability and technical audit of exchanges
• Multi-environment support

With Conex solutions, your customs data flows are integrated and automated. You orchestrate your transmission chains; we secure your interoperability.

Related terms

• IT interoperability
• Dematerialisation of formalities
• System integration
• Secure data transmission