Sparkpost bounced email handling

Hi I am using self hosted and trying to intergrate Sparkpost ().

Sending emails is fine, but I am having trouble at the webhook. I have followed your docs and but neither get me ‘success’ when I try to save, with and without CORS active (ref inmotion setting)

Code:
HTTP/1.1 500 Date: Thu, 23 Nov 2017 09:20:05 GMT Content-Type: application/json Content-Length: 402 Connection: close Set-Cookie: __cfduid=dcb28afbaacdb8e0fe9416385e95fff6f1511428804; expires=Fri, 23-Nov-18 09:20:04 GMT; path=/; domain=.highestperforming.com; HttpOnly; Secure,a21b8c3b8a4017c03c1a0864e6b0a831=o33vidc5mgjot6f6qilv3bmia2; path=/; secure; HttpOnly Cache-Control: no-cache Accept-Ranges: bytes Vary: User-Agent X-Turbo-Charged-By: LiteSpeed Server: cloudflare-nginx Cf-Ray: 3c230cecbb6c9637-SJC

I have contacted their support and they sent me to

Hi I am using self hosted and trying to intergrate Sparkpost ().
Sending emails is fine, but I am having trouble at the webhook. I have followed your docs and but neither get me ‘success’ when I try to save, with and without CORS active (ref inmotion setting)

HTTP/1.1 500 Date: Thu, 23 Nov 2017 09:20:05 GMT Content-Type: application/json Content-Length: 402 Connection: close Set-Cookie: __cfduid=dcb28afbaacdb8e0fe9416385e95fff6f1511428804; expires=Fri, 23-Nov-18 09:20:04 GMT; path=/; domain=.highestperforming.com; HttpOnly; Secure,a21b8c3b8a4017c03c1a0864e6b0a831=o33vidc5mgjot6f6qilv3bmia2; path=/; secure; HttpOnly Cache-Control: no-cache Accept-Ranges: bytes Vary: User-Agent X-Turbo-Charged-By: LiteSpeed Server: cloudflare-nginx Cf-Ray: 3c230cecbb6c9637-SJC

I have contacted their support and they sent me to