How to Send Notice to Boxcar 2

[billbrazeal]

I am fairly new to HG but I am making progress slowly.  I would like to use Boxcar 2 for HG to send notices to.  To send a notification, you just have to send a POST HTTPS request to the following endpoint:  https://new.boxcar.io/api/notifications.  But I have not seen any examples of sending a POST.  There is also the following syntax of using curl with parameters:

curl -d "user_credentials=ACCESS_TOKEN" \
     -d "notification[title]=message title" \
     -d "notification[long_message]=<b>Some text or HTML for the full layout page notification</b>" \
     -d "notification[sound]=bird-1" \
     -d "notification[source_name]=My own alert" \
     -d "notification[icon_url]=http://new.boxcar.io/images/rss_icons/boxcar-64.png" \
     https://new.boxcar.io/api/notifications

Can anyone help me with how to make this work in HG?

Thanks!