Error handling

1
operations:
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  sendMessage:
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    action: send
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    channel:
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      $ref: '#/channels/messages'
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    x-fern-error-handling:
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      error_schema:
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        $ref: '#/components/schemas/MessageError'
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      error_status_codes:
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        - 400
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        - 429
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        - 500
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      retry_on_errors:
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        - 429
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        - 500