Got a nice one on my MAMP:
result:{"access_token":"***","expires_in":4788564,"token_type":"bearer"} Array ( [url] => https://api.twitch.tv/helix/eventsub/subscriptions [content_type] => application/json; charset=utf-8 [http_code] => 400 [header_size] => 471 [request_size] => 229 [filetime] => -1 [ssl_verify_result] => 0 [redirect_count] => 0 [total_time] => 0.23778 [namelookup_time] => 0.002058 [connect_time] => 0.008459 [pretransfer_time] => 0.050223 [size_upload] => 192 [size_download] => 94 [speed_download] => 396 [speed_upload] => 810 [download_content_length] => 94 [upload_content_length] => 192 [starttransfer_time] => 0.05023 [redirect_time] => 0 [redirect_url] => [primary_ip] => 199.232.150.214 [certinfo] => Array ( ) [primary_port] => 443 [local_ip] => 192.168.68.120 [local_port] => 65161 [http_version] => 3 [protocol] => 2 [ssl_verifyresult] => 0 [scheme] => HTTPS [appconnect_time_us] => 49884 [connect_time_us] => 8459 [namelookup_time_us] => 2058 [pretransfer_time_us] => 50223 [redirect_time_us] => 0 [starttransfer_time_us] => 50230 [total_time_us] => 237780 ) created sub FAILED: {"error":"Bad Request","status":400,"message":"missing or unparseable subscription condition"}
On the server it fails. Code seems to be okay then.