As an author, I am seeking guidance on how to obtain and integrate purchase keys into my software. I need step-by-step instructions or a tutorial explaining the process, including how to generate unique keys for each purchase and how to securely add them to my software for authentication and activation purposes. Any insights or best practices on managing purchase keys effectively would be highly appreciated.
You’re asking too much 
Search CodeCanyon for Envato plugins and/or the forum
But at some point you will have to do some coding, too.
If you’re talking about managing via the purchase codes buyers get them look at the guidelines from @baileyherbert but as @ki-themes said you are going to need to write code
This one from @baileyherbert should help.
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