Required application Scope: registration:create. Only published catalog records owned by the authenticated application are visible. Public experts additionally require WECHAT_MINI_APP in Candidates.public_platforms, an undeleted candidate, and published_at not later than now.路径 expert_id 为公开资料 ID。只创建约访请求;不会创建财务 Task、支付或发送通知。请求联系人必须存在且未删除,客户端身份归属由接入方服务端验证。鉴权:每次请求使用独立 Nonce 和当前秒级时间戳,签名必须基于实际发送的请求体字节;完整协议见项目内《NDB 第三方服务端接入指南》。本接口示例数据均为虚构值。