Hi,

Once you bought the license, keep/register the received subscription code in the production database. In order to use this db in staging or in testing environment, you don't need to register the subscription code there.

In the test environment, you can created multiple database and this db will be automatically get expired after 30 days. 

1. Once you bought license, you will receive the code as well as a subscription code, register the subscription code in production database. 

For testing purpose you can create N number of db's which will automatically get expired in 30 days. If you need copy of live to test, you can take a back up from the live database and restore it in the test, once restore tick the Neutralize flag and once testing is done, drop the db.

2. No need to make a separate license for test instance, copy the code from production and create test instance.

Thanks & Regards

Walnut Software Solutions