[Tokend-Dev] return what error code from tokend when verify PIN error

[liuddd]

Hi， everyone！
        I  have written a tokend, when user input the wrong PIN, Safari or KeyChain will not prompt user to input password again, how to inform Safari or Keychain that user should input PIN again, what error code should I return from tokend? Is there any document about this situation?  thanks ! 
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