Sandbox VS Production

Billit provides two distinct environments tailored for developers. The first environment is linked directly to all production accounting data and e-invoice networks, enabling real-world data processing and communication. The second environment is a replica of the production setup, designed for testing purposes. By utilizing test networks, developers can ensure that their data does not get transmitted to government entities or e-invoice networks inadvertently, offering a secure sandbox for development and experimentation.

You can find more info here Sandbox VS Production

Isolated test environment	Production environment
https://my.sandbox.billit.be	https://my.billit.be
https://api.sandbox.billit.be	https://api.billit.be
Create new sandbox account here	https://my.billit.be/Account/Register

Are Sandbox and Production linked to each other?

No Sandbox is fully isolated from Production meaning it runs separately. So the API key used on Production will not work on Sandbox and vice versa.