groupPolicy property
GroupPolicy is how this org admits group and thread rooms here: "open", "allowlist" or "disabled", defaulting to "open". Both policy fields come back EMPTY — rather than the listing failing — when the policy cannot be read; GET /v1/channels/allowlist carries the same two with the entries they consult.
Please note: This property should have been non-nullable! Since the specification file does not include a default value (using the "default:" property), however, the generated source code must fall back to having a nullable type. Consider adding a "default:" property in the specification file to hide this note.
Implementation
String? groupPolicy;