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WordPress "missing the required permission_callback argument" error

  • 27 October 2021
  • 1 reply

I’m having the same issue of this post. 


is there any update on the matter?


register_rest_route was called incorrectly. The REST API route definition for zapier/v1/token is missing the required permission_callback argument. For REST API routes that are intended to be public, use __return_true as the permission callback. Please see Debugging in WordPress for more information. (This message was added in version 5.5.0.)


Best answer by SamB 1 November 2021, 14:14

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Userlevel 7
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Hey @lucacapula,

Welcome to the Community and thanks for reaching out about this! :)

I’ve checked on the bug report that was discussed in that other post and it looks like the issue is still open. I don’t have an ETA on when it will be fixed but I’ve added you to the list of users affected by this. We’ll notify you by email as soon as it’s sorted.

As noted in the other post, the integration itself appears to still be running correctly despite this error being surfaced in the WordPress debug logs.