Invoke-RestMethod -Method POST -Uri https://my.org/zabbix/api_jsonrpc.php -ContentType application/json -Body (@{jsonrpc="2.0";method="apiinfo.version";params=@{};id=1} | ConvertTo-Json)
(Invoke-RestMethod -Method POST -Uri https://my.org/zabbix/api_jsonrpc.php -ContentType application/json -Body (@{jsonrpc="2.0";method="user.login";params=@{user="UserName";password="Password"};id=1} | ConvertTo-Json)).result