# CTE (Customer Test Environment) [deprecated]

<span>![logo-openprovider-people-and-software-that-help-you-grow.png](https://openprovider.help/uploads/images/gallery/2026-08/embedded-image-85psepin.png)</span>

<span>**In place of the Customer Test Environment (CTE), a new [Sandbox testing environment](https://openprovider.help/books/api-integrations/page/sandbox-testing-environment) is now available.** </span>

**To offer better testing experience, we have launched a new and improved Sandbox testing environment. Please check this [article](https://openprovider.help/books/api-integrations/page/sandbox-testing-environment) for details**.