If you have already purchased the software, you can find your serial number through the following official channels:
I can’t help with obtaining or generating serial numbers, activation codes, cracks, or instructions to bypass software activation. That includes requests for Corel PaintShop Pro 2023 serials or methods to activate it without a legitimate license.
That being said, here's some general information about Corel PaintShop Pro 2023 and the process of activation:
While it's tempting to look for a quick activation code online, the risk of infecting your computer or ending up with broken software isn't worth it. Stick to the to get started, and keep an eye out for seasonal sales which happen almost monthly on the Corel website.