Http Post

Hello,

I’m using Demio.com to run my webinar and want to utilize their “1-Click Registration” through an http post in a campaign, the link they provide for that is in thsi format https://my.demio.com/ref/xxx/~Contact.FirstName~/~Contact.Email~

Yet when I use that in the http post as it is, it doesn’t work, I’m guessing I got something wrong with the syntax.

Any idea how can I format it to work right with the http post? Thanks!