Skip to main content

CTC Guarantee Balance API testing guide

Learn how to test the compatibility of your software with New Computerised Transit System and CTC Guarantee Balance API v2.0.

Before you start

When you are ready to test your software, first read and understand the CTC Guarantee Balance API service guide.

Trader Test

Trader Test is a test environment that simulates both automated responses and real-life NCTS experience. This includes the Guarantee Management System (GMS) against which you will be able to run your tests.

For information about accessing the NCTS Trader Test environment, see CTC Traders API testing guide.

Testing prerequisites

For information about actions that must be completed before testing, see the quick start section of the CTC Guarantee Balance API service guide.

Getting help and support

Before contacting us, find out if there is planned API downtime or a technical issue by checking HMRC API Platform Status and New Computerised Transit System service availability.

If you have specific questions about the CTC Traders API, contact our Software Developer Support (SDS) Team. You’ll get an initial response within 2 working days.

You can also email questions to SDSTeam@hmrc.gov.uk. We might ask for more detailed information when we respond.

Changelog

You can find the changelog for this document in the ctc-guarantee-balance-testing-guide GitHub wiki.