First of all: You won't need to purchase an extra license!
A developer license can be generated via My Atlassian. After logging in, you will be directed to the license area. There, you open the product for which you need the developer license. You will gain more information about the product, including the area covered by your current license key. Underneath this area, you find the actions menu:
Choose View Developer License to display the license for your staging system in a pop-up window.
You must be one of the technical contacts of the license. Otherwise, you won't see all options. If you are not a technical contact, ask one of the displayed technical contacts to add you or generate the license.
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