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If that's the case, the modification should be in SNSRouter, not SNSAPI. There are other applications built on SNSAPI, so any change of interface is sensitive. You need to thorough test to make sure that others are not broken.

You can do as follows:

   * Revert the above modification to keep original behaviour.
   * In SNSRouter side, you can manually set `SNSBase. _token_filename = YOUR_CUSTOM_FUNCTION`.