OptionalacceptOptionalinviteIf the caller has a keypair 3pid invite, the signing URL is passed in this parameter.
OptionalviaThe server names to try and join through in addition to those that are automatically chosen. Only the first 3 are actually used in the request, to avoid HTTP 414 Request-URI Too Long responses.
Previously, configured whether to accept encrypted history shared by the inviter. This is now always enabled, and the setting is only retained to avoid a breaking change to the API. It has no effect.