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static NSInteger const maxRetryCountForFetchingTicket = 10;

- (void)_handleFetchTicketFailWithError:(NSError *)inError petID:(NSString *)inPet
{      
    if ([inError code] == KKInvalidSessionError) {
        //error handling
        return;
    }
    
    retryCount ++;
    if (retryCount == maxRetryCountForFetchingTicket) {
        retryCount = 0;
        //retry count run out, handle error
        return;
    }
    
    // _fetchPetContentWithSongID is the API call.
    [self performSelector:@selector(_fetchPetContentWithPetID:) withObject:inPetID afterDelay:2.0];
}

- (void)_fetchPetContentWithSongID:(NSString *)inPetID 
{
    // use NSURLSession or NSURLConnection to make API call.
}