It should be https 200ok for an SEO Website and it's 200ok for SEOSiri, 

SEOSiri Webhook https code status 200 vs 405:

The main differences are that not having the proper URL path like a complete URL with an ending path means URL status 200 and neither does a complete URL with a proper ending path mean URL status 405.

SEOSiri Blog's Webhook History for SEOSiri Newsletter-https://blog.seosiri.com/newsletter

SEOIRI NEWSLETTER WEBHOOK EVENTS:

post_publishedpost_updatedpost_deleted

SEOSiri newsletter Webhook Response HTTP  200

{ "cache-control": "s-maxage=3, stale-while-revalidate", "content-encoding": "br", "content-security-policy": "default-src *; script-src * 'unsafe-eval' 'unsafe-inline'; style-src * 'unsafe-inline'; font-src *; img-src * data:", "content-type": "text/html; charset=utf-8", "date": "Wed, 18 Oct 2023 17:04:48 GMT", "etag": "W/\"12p48becrsj1i4r\"", "referrer-policy": "origin-when-cross-origin", "server": "Vercel", "strict-transport-security": "max-age=63072000", "x-content-type-options": "nosniff", "x-frame-options": "deny", "x-matched-path": "/newsletter", "x-powered-by": "Next.js", "x-vercel-cache": "MISS", "x-vercel-id": "pdx1:pdx1:pdx1::pdx1::-----------------------", "connection": "close", "transfer-encoding": "chunked" } 

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URL status 405 vs 200, Recommended read, read more- https://www.seosiri.com/2023/10/seosiri-webhook.html