Could you send me a copy of the SKETCHUP 2022 and 2023 SDK?
No. You must apply for it yourself.
https://extensions.sketchup.com/sketchup-sdk
https://developer.sketchup.com/
I cannot send international mail from China.
Duplicate from this one I guess
you don’t have to send international mail to anywhere. just to fill in a form to apply as a dev.
Developer Application | SketchUp Extension Warehouse
Developing Extensions for Extension Warehouse | SketchUp Help
Can I apply as an individual?
developers are individuals indeed. anyone can be one.
Thank you