Shopify App Review Mandatory Webhooks issue

App must verify the authenticity of the request from Shopify.

Expected either HTTP 400 (BadRequest), 401 (Unauthorized), or 403 (Forbidden), but got HTTP 200 from https://industrieswingtag.prosperdigital.com.au/SwingTagIntegrationV2/api/webhooks/shop/redact. Your app’s HTTPS webhook endpoints must validate the HMAC digest of each request, and return an HTTP 401 (Unauthorized) response when rejecting a request that has an invalid digest.