All the Z-Push state files are located on /var/lib/z-push. I deleted them all for an user and then boom everything started working.

I was able to fix the issue with the following lines on Apache as Reverse Proxy

ProxyPass /soap/v1/ https://api.authorize.net/soap/v1/ ProxyPassReverse /soap/v1/ https://api.authorize.net/soap/v1/

I assume this can also be done on Ngnix as well. So I will find out.

@JaredBusch said in Looking for how-to on setting up a proxy:

server {
client_max_body_size 40M;
listen 80;
server_name support.bundystl.com;
rewrite ^ https://$server_name$request_uri? permanent;
}

Yep, got all that done and it's working well. What I was referring to was redirecting traffic to HTTPS. Essentially this is the part of the file I was missing...

server { client_max_body_size 40M; listen 80; server_name support.bundystl.com; rewrite ^ https://$server_name$request_uri? permanent; }