title: iOS Paypal SDK Integration Compilation issues
body: <p>I'm trying to get Paypal's iOS SDK working. I have followed the instructions in the readme but the build fails with the error below</p>
  
  <pre><code>Undefined symbols for architecture armv7:
    "_OBJC_CLASS_$_NSExtensionItem", referenced from:
        objc-class-ref in libPayPalMobile.a(OnePasswordExtension.o)
    "_OBJC_CLASS_$_NSItemProvider", referenced from:
        objc-class-ref in libPayPalMobile.a(OnePasswordExtension.o)
    "_kUTTypePropertyList", referenced from:
        -[OnePasswordExtension processExtensionItem:completion:] in libPayPalMobile.a(OnePasswordExtension.o)
  ld: symbol(s) not found for architecture armv7
  clang: error: linker command failed with exit code 1 (use -v to see invocation)
  </code></pre>
  
  <p>This same error occurs when building the sample application, so I have ruled out my project settings. </p>
  
  <p>Can anybody tell me what I've missed?</p>