NTKS is a system for submitting declaration data and exchanging information and data on the acceptance of declarations, the progress of their processing and the completion of customs formalities.
The NTKS processes data from the following declarations:
- Standard transit declarations (with or without safety and security data);
- TIR carnet data (with or without safety and security data).
General information
This section contains information needed to develop software for submitting the data of the above declarations to the NTKS via a system-to-system (S2S) connection, as well as for testing the developed software.
Specifications and XSD schemas
NTKS client interface specification
The NTKS client interface specification is a package of documents defining the interface between the NTKS, which complies with the requirements of the Union Customs Code, and the application software systems used by customs clients. Communication between the NTKS and the client system takes place via the EM-VARTAI system, using web services described in the specification "EM-VARTAI for external systems".
The NTKS client interface specification describes action sequence diagrams corresponding to customs business processes, electronic message exchange scenarios, the structures of electronic messages exchanged between the NTKS and the client information system (understood as XML documents), XSD schemas and other technical information.
Document package (entry into force: 31 March 2026):
- NTKS client interface specification (download);
- National Transit Application Design Document (DDNTA) v.5.15.2, Appendix R: XML Mapping (download);
- NTKS message structures (download);
- LT rules and conditions (download);
- Transit accompanying document printing guidelines (download).
EM-VARTAI specification for external systems
The EM-VARTAI specification for external systems is the specification of the web services of the ESB module EM-VARTAI, intended for communication between external systems and customs subsystems. The specification covers authentication and authorisation services for external systems, as well as services for communication between external systems and internal customs systems.
EM-VARTAI specification for external systems (download).
NTKS and EM-VARTAI specification (download).
XSD schemas
Electronic message XSD schemas (download).
Lists and classifiers
You can download the lists and classifiers used by the NTKS for submitting declaration data (download).
Normative data list code equivalents (download).
Information for testing
Requirements
Developers of software for submitting transit declaration data may test their application software interfaces with the NTKS.
Those wishing to carry out such testing must submit a request to [email protected] as specified in Annex A of the NTKS testing guidelines for application software developers/owners.
The software must be developed in accordance with the NTKS client interface specification and the EM-VARTAI specification for external systems, and the NTKS external testing guidelines must be read prior to testing (download).
Testing is divided into two stages:
Stage I – connection session establishment testing;
Stage II – functional testing.
Functional testing will only be scheduled after connection session establishment testing has been completed successfully.
Software developers must register the software they are developing in the EM-VARTAI network interface as described in the document "NTKS testing guidelines for application software developers/owners".
Register as a recipient of electronic services in the BAP testing environment.
If the identity verification means provided by the Electronic Government Gateway are insufficient, you may submit a request to customs to register as a service recipient using the registration form for unauthenticated persons at https://bap-app-tst.lrmuitine.lt/bap-app/register/unauthenticated.
EM-VARTAI network interface access point → https://s2s-tst.lrmuitine.lt/ws/egtwSSO:EgtwS2SWS_v1r0?WSDL.
Testing code lists and classifiers
This section contains the lists and classifiers needed for testing the developed software.
Lists for NTKS testing → NTKS-P5_V1_BUNDLE in XML format.
- Common User Management Portal (BAP)