Has anyone implemented giving access to a third party supplier to screen candidates?

Summary:

I'm interested to know if anyone has implemented this and how the security would work to give access only to specific requisitions. Visibility of requisitions is currently governed by AORs but a third party supplier would not be employees so I don't think it's possible to assign AORs. I'd appreciate any advice on how third party access can be achieved. Thanks

Content (required):

I'm interested to know if anyone has implemented this and how the security would work to give access only to specific requisitions. Visibility of requisitions is currently governed by AORs but a third party supplier would not be employees so I don't think it's possible to assign AORs. I'd appreciate any advice on how third party access can be achieved. Thanks