I have test, staging and production JIRA instances. Do I need a commercial license for each of them?
The Configuration Manager for JIRA license must match the license of JIRA itself. Usually, you'll need commercial license only for the production instance. Once you purchase a Configuration Manager for JIRA license, you'll be able to generate development licenses for your test and staging instances.
If you have a commercial CMJ license, you can obtain dev licenses from my.atlassian.com as described here: https://www.atlassian.com/licensing/purchase-licensing?_ga=1.167884517.53990726.1485781377#licensing-7
Will Configuration Manager for JIRA migrate issues between instances?
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