api_key doesn't seem to work for the imgur service, using client_id works

roles/matrix-bot-go-neb/defaults/main.yml

@@ -124,12 +124,13 @@ matrix_bot_go_neb_services: {}
 #      cx: "AIASDFWSRRtrtr"
 #
 ## Get a key via https://api.imgur.com/oauth2/addclient
-## Select "oauth2 without callback url" and use the clientid as api_key value
+## Select "oauth2 without callback url"
 #  - ID: "imgur_service"
 #    Type: "imgur"
 #    UserID: "@imgur:{{ matrix_domain }}" # requires a Syncing client
 #    Config:
-#      api_key: "AIzaSyA4FD39m9"
+#      client_id: "AIzaSyA4FD39m9"
+#      client_secret: "somesecret"
 #
 #  - ID: "wikipedia_service"
 #    Type: "wikipedia"