The Apple auth chip is a kind of closed thing. You should get approval from Apple to use it in your project. Then you can order 1- 100 chips. After that your device should pass MFI certification procedure. And only then you can buy these chips in desired amount.
If you need only one chip for you project, you can get it from some accessory device such as iphone stereo dock.
The interconnections of this chip are very simple, you can use soic-8 breakout board like this **broken link removed**
The photo of my variant of breakout board attached