Authorization GET request fails

[Flashnode-developers]

I've set up my Application and set it as a Test app. I also created an Integration for it, which was approved. I'm trying to authorize using the following URL:

https://integration.visma.net/API/resources/oauth/authorize?state=[RANDOM]&response_type=code&redire...

This gives me the following error: 

{"error":"unauthorized_client","error_description":"The client is not authorized to request an authorization code using this method."}

What could be wrong here? I got here through trial and error as I first had invalid values for scope and response_type, and I noticed that changing the value of client_id results in the same error.

[Flashnode-developers]

The client ID is isv_flashnode_test. I've pretty much done everything in that guide (I followed a different one but it had the same stuff) except publishing the app in the App Store. I figured this wasn't necessary with a test application.

[Magnus Johnsen]

Since the integration is registered via the dev portal, you shouldn't use the legacy authorization method.
Please have a look at this documentation for the Visma developer portal.

If you are still having issues after this, please send us an email at developersupport@visma.com with details regarding what you currently have set up. Please include screenshots from the portal as well.

Thank you. 

[Magnus Johnsen]

Are you using the developer portal?
If so, please have a look at this article:

Guide - Move from VNI to Visma Connect Authentication for Visma.net ERP API

If reading this does not help you, please let us know.

Thank you. 

[Magnus Johnsen]

Hi,

Could you please send us your clientID and we'll have a look if there is any issues with it.

Thank you.