What I will get after purchasing subscription?

What I will get after purchasing subscription?
A key? or Some Package?
How can I implement after purchasing as without purchasing I already implemented in my project?

Hi,

Please note that the evaluation version is not intended for development use, just to make sure the product will work for you. After purchasing a subscription, you will receive a product serial number and instructions on how to login to our customer area to retrieve your license key. There will also be instructions on how to apply the license key to your project. Once the license key is properly applied, the watermark will be removed for converted documents.

Let us know if you need further clarification.

Thanks,
ceTe Software Support Team