Pin a spec version when we link to it
@@ -48,7 +48,7 @@ To solve this problem, two new endpoints will be added to the Client Server
API: `POST /account/3pid/bind` and `POST /account/3pid/add`. Both will
require authentication and be rate-limited. The request parameters of `POST
/account/3pid/bind` are the same as [POST
-/account/3pid](https://matrix.org/docs/spec/client_server/unstable#post-matrix-client-r0-account-3pid),
+/account/3pid](https://matrix.org/docs/spec/client_server/r0.5.0#post-matrix-client-r0-account-3pid),
minus the `bind` flag, and the contents of `three_pid_creds` have been
brought to the top level of the request body. The request parameters of `POST
/account/3pid/add` will simply consist of a JSON body containing
@@ -135,14 +135,14 @@ The threepid has now been added to the user's account.
To achieve the above flows, some changes need to be made to existing
endpoints. The `id_server` and `id_access_token` parameters are to be removed
from the Client-Server API's [POST
-/account/3pid/email/requestToken](https://matrix.org/docs/spec/client_server/unstable#post-matrix-client-r0-account-3pid-email-requesttoken)
+/account/3pid/email/requestToken](https://matrix.org/docs/spec/client_server/r0.5.0#post-matrix-client-r0-account-3pid-email-requesttoken)
and [POST
-/account/3pid/msisdn/requestToken](https://matrix.org/docs/spec/client_server/unstable#post-matrix-client-r0-account-3pid-msisdn-requesttoken)
+/account/3pid/msisdn/requestToken](https://matrix.org/docs/spec/client_server/r0.5.0#post-matrix-client-r0-account-3pid-msisdn-requesttoken)
endpoints, as these endpoints are now only intended for the homeserver to
send validation requests from.
Additionally, the [POST
-/account/3pid](https://matrix.org/docs/spec/client_server/unstable#post-matrix-client-r0-account-3pid)
+/account/3pid](https://matrix.org/docs/spec/client_server/r0.5.0#post-matrix-client-r0-account-3pid)
endpoint is deprecated as the two new endpoints replace its functionality.
The `bind` parameter is to be removed, with the endpoint functioning as if
`bind` was `false`. Allowing an endpoint to add a threepid to both the
