Any leads associated with with a Lead Ad. Since these leads belong to a business' Page, not the ad itself, you need to be a Page Admin to access these. Alternately you can have permissions granted to you by the Page Admin. See Retrieving Leads.
Reading
GraphAdgroupLeadsEdge
Example
GET /v25.0/{adgroup-id}/leads HTTP/1.1
Host: graph.facebook.com
There have been too many calls to this ad-account. Wait a bit and try again. For more info, please refer to /docs/graph-api/overview/rate-limiting#ads-management.
100
Invalid parameter
190
Invalid OAuth 2.0 Access Token
104
Incorrect signature
Creating
Updating
You can't perform this operation on this endpoint.
Deleting
You can't perform this operation on this endpoint.