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+# Integrating with Steam and other game store accounts
+
+# Requirements
+
+## Seamless Steam Accounts
+
+- Users launching BAR on Steam must be able to login for online play without
+  the need for registration.
+  - This user experience is unlike the current flow which requires registration
+  prior to online play.
+- Users must be able to manage their account on server4.beyondallreason.info.
+  - If the user has never registered automatically by launching BAR on Steam,
+  server4.beyondallreason.info must provide a registration flow with Steam as
+  the ID provider.
+  - If the user has registered via Steam, a 'login with steam' button must be
+  provided on server4.beyondallreason.info.
+
+## Upgrade Path For Current Players
+
+- Players with pre-existing BAR accounts (henceforce called 'legacy accounts')
+  must be able to migrate seamlessly onto Steam. To comply with the
+  [no smurfs rule](https://www.beyondallreason.info/code-of-conduct#5-unfair-advantages)
+  note the following:
+  - Players may create a new account linked to Steam and link the newly created
+    Steam account with their legacy account.
+      - Legacy account owners may unknowingly start BAR on Steam and play with
+      the new Steam account prior to linking their legacy accounts - resulting
+      in unintentional 'smurfs'. We must provide clear policy guidance, e.g. a
+      possible grace period for 'accidently' playing on these smurfs, send
+      notifications for these 'smurfs' to link their accounts.
+  - Alternately, players must be able to log into their legacy accounts via
+    server4.beyondallreason.info and link to a Steam account.
+
+## (Stretch) Support For Additional Game Stores
+
+- We may want to also have the same Steam experience with other game stores
+  (e.g. Epic Games).
+  - The design should allow any account to be linked to any number of additional game stores.
+
+## (Stretch) Support For Unlinking
+
+- We may provide the ability for players to request accounts to be unlinked.
+
+## (Stretch) Deprecation of Legacy Account Creation
+
+- Once BAR on Steam is generally available, we may no longer support the
+creation of accounts through the current flow, i.e. through BYAR-Chobby via the
+[REGISTER](https://springrts.com/dl/LobbyProtocol/ProtocolDescription.html#REGISTER:client)
+command.
+
+# Additional Thoughts (Unorganized)
+
+## Support additional identity providers
+
+We should not restrict players from authenticating via any of their preferred
+methods:
+- Via the legacy flow
+   - Through the web portal at server4.beyondallreason.info
+   - [LOGIN](https://springrts.com/dl/LobbyProtocol/ProtocolDescription.html#LOGIN:client)
+- Using Steam as the ID provider
+- Using any other game store as the ID provider.
+- Using any identity provider? (Login via Facebook??)
+
+When evolving the account system, adding any number of additional ID providers
+should be part of the 'regular flow'.
+
+## Unique In Game Identifier
+
+Steam allows users to rename themselves at any time. Additionally, Steam in game
+names are not necessarily unique.
+
+- BAR Replays already store the 'accountid' of the player. However, replays also
+store the name of the player which should now be treated as ephemeral.
+  - How do we deal with renaming while allowing searching replays?
+    - Any UI can no longer display the player name as stored in the replay file,
+    but must instead use the stored 'accountid' to lookup the current player
+    name.
+    - How does this experience work when players want to lookup a specific match
+    in their history? I.e. a player may say "Oh I want to lookup the match I had
+    against 'Zow' in the past", but 'Zow' has renamed to 'Clyret'.
+
+## Linking Accounts
+
+When linking accounts, how do we merge the data?
+
+A simple first implementation would be to just take the data of the older
+account.