currently i use the "Classic" Paddle SDK on mac, and API on Windows, since they got rid of the Windows SDK.
on mac, it's entirely in-app, and the return value of successful purchase is the serial number, so the user doesn't have to enter it.
on Windows, it used to be the same, when they supported the win SDK, but since they pulled that rug, it now goes to a web site for the purchase, and at the end the user is presented with the serial number, which they copy. switching back to the app, it notices the SN on the clipboard and enters it for them, so even then they do not have to enter it.
my WISH is to go back to a fully in-app method, like we have now with the mac. but the mac SDK is soon to be discontinued too, and their licensing server is ALSO going offline so they will no longer manage serial numbers. (i have a rant with the fury of a thousands suns about all this).
so, what eCommerce solution do folks use, who provide in-app purchase, and manage serial numbers, activations, license checks etc?