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How does your purchase code work?

You should register the purchase code for your main domain firstly, then you can use as many sub-domain as you want. Please refer this article

https://arrowhitech.ticksy.com/article/15429/edit/

Please note: Main domain should be simple such as: abc.com

Then if you want to change your main domain, you have a chance to do so by refering this article

https://arrowhitech.ticksy.com/article/15366/edit/