Web Development

I am trying to build an integration for ConnectWise and a companies website so that when they are logged into the site they don't have to login again to get into the ConnectWise portal. I did this originally with what they are now calling the Legacy portal via URL format such as this.

https://[SITE URL HERE]/v4_6_release/services/system_io/Portal/Default.aspx?Company=dti&txtemail=&txtpass=[PASS HERE]&submit=Support+Site

This system has worked for a long time and a lot of people find it extremely useful to have available however I have to know if there is anyone out there that might be able to provide any information on how to accomplish this with the newest Connectwise Portal?