> On Nov 6, 2014, at 9:00 AM, sqwarqDev <sqwarq...@icloud.com> wrote: > > I have a reasonably well-developed free OS X app (i.e., by well-developed I > mean I've got a stable user base), and I'm now wanting to add extra features > that require purchasing a licence. This seems a common model, but I can't > find any guidance on exactly how do I generate and test for valid licence > keys at run time?
One answer, which I prefer, is to contract with a commercial e-commerce provider. I use eSellerate, a Digital River company, but others like Kagi are also available. They handle credit card, PayPal and similar processing and foreign currency exchange for you, and they normally produce the license keys and issue them for you. In the case of eSellerate, they provide OS X frameworks that you incorporate into your application to allow in-app purchase over the Internet and/or an Internet "Buy Now" button that you can incorporate in your website. You can choose from a variety of ways to have your application check the vailidity of a user's key, including online validity checks that are completely invisible unless the key is invalid or has been blackballed (these systems seem to handle the user being offline occasionally just fine). They charge varying fees, perhaps something like 8% for an application with a modest customer base. I am delighted to pay this fee for the service I get -- I have no interest in figuring out how to implement a registration key issuing and monitoring framework myself. You normally do have to write some code to integrate the e-commerce provider's software into your application, if you support in-app purchase. The eSellerate software comes with a very detailed programmer's guide and example code that makes the process reasonably easy. -- Bill Cheeseman - b...@cheeseman.name _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
