What if customs management were automated, compliant and convenient? Meet CAS. Zero-touch customs compliance. End-to-end automated.

See Customs4trade for more background on customs4trade and our product CAS.

Modules

CAS consists of modules that can be used on their own or combined depending on your needs.

Declarations

Automate your declaration filing, reducing shipment lead time from hours to minutes. The CAS Declarations module supports multiple declaration types in multiple countries for import, export, and transit, as well as other documents required for a customs filing process, such as EIDRs or port-related documents.

Special procedures

Take advantage of special duty regimes that allow you to store, temporarily use, process, or repair your goods and get either suspension, partial or complete relief from import duty. The use of Special Procedures can be particularly beneficial for companies dealing with processing, distribution, and other manufacturing activities that are subject to high duty rates.

Excise movements

Manage your excise movements end-to-end. CAS handles the creation and follow-up of electronic administrative documents (e-ADs) and supports actions such as change of destination, receipt reports, and more.

Tax warehouse

Keep track of your tax warehouse stock with CAS. The Tax Warehouse module provides stock management capabilities including movement orders, adjustments, and inventory tracking for goods stored under duty suspension.

Origin management

Request and manage certificates of origin for your goods. The Origin Management module allows you to submit certificate of origin requests based on your declarations and download the resulting documents.

Sync your data

Part of managing your customs operations includes connecting your WMS or ERP system to your customs software. Using CAS, C4T's customs management solution, you can either automate integration using intuitive APIs, or upload data using Excel files.

APIs

APIs connect your system to CAS for real-time data exchange. Based on a trigger on your end, you can send data to CAS automatically to have your customs declaration created. Our intuitive APIs notify you of exceptions, invalid declarations, and can solve customs errors, extract the finalized declaration from CAS, and more.

API Reference          API Specification

Excel Upload

Excel upload offers the possibility to upload your shipments using an Excel template. You simply download the Excel template from CAS, complete it with all required data, and upload it directly into CAS. Your declaration will be created, and you can follow up on it accordingly.

Documentation map

If you are integrating with the CAS API, we recommend reading the guides in the following order:

Getting connected

• Quick start tutorial — End-to-end walkthrough from authentication to downloading a declaration
• Authentication — OAuth 2.0 setup, scopes, and tenant identification
• Integration methods — HTTPS, TLS, rate limiting, resilience

Sending data

• Generic data models — Key concepts: customs shipments, declarations, master data
• Customs flows — How CAS processes your data, message types, correction mechanisms
• Sending data to CAS — All ingestion endpoints and their data models

Working with declarations

• Declarations — Searching and retrieving declarations
• Declaration items — Managing individual goods items
• Declaration actions — Submit, invalidate, amend, and other post-creation actions

Notifications

• Notifications — Webhook setup, event types, and subscription management

Special procedures and advanced features

• Movement orders — Warehouse and special procedure stock management
• Formulas and material lists — Special procedure master data (formulas, material lists)
• Certificates of origin documents — Requesting and downloading CoO documents

Reference

• Data types — Date, currency, country code formats
• Declaration statuses — All possible declaration statuses
• Notification events — Event types, subtypes, and payload structures
• Error handling — HTTP status codes, RFC 7807 errors, async error patterns