docs: function find (client) {
    return function find (pushAppId) {
      const req = {
        url: pushAppId ? `${client.baseUrl}/rest/applications/${pushAppId}` : `${client.baseUrl}/rest/applications/`
      };
  
      return request(client, req)
        .then((response) => {
          if (response.resp.statusCode !== 200) {
            return Promise.reject(response.body);
          }
  
          return Promise.resolve(response.body);
        });
    };
  }