Assignment APi - Update Html_url field problem

[Alexandre_Sch]

Hello community o/ 

I have a proctoring tool that is working fine on my off-line enviroment. Now i need to create a integration beetween my service and Canvas, but i'm kinda lost. 

I already have a lti integration with canvas using oAuth2. What i'm trying to do: 

Create a admin panel, just like Respondus panel, to mark as "Checked" each assignment that will be proctored. The point is: When i mark one assignment as checked, i dont know how to change the url from that assignment to my service.

I looked up assingment api:

There is a field: 

html_url

but this field is not editable from the api (tested on the live API and directly on my integration). 

How can i make canvas understand that i checked as "Proctored" and instead of opening the assignment itself, open another page to make the checks i need and if all goes ok, send the student back to the assingment itself. 

Edit: Partner program will help achieving what i asked!

Regards,
Alexandre Schneider