Где хранить ключ, если вы не программист

var API = "https://planerka.app/rest/v2";

function key() {
  return PropertiesService.getScriptProperties().getProperty("PLANERKA_API_KEY");
}

function call(method, path, version, body) {
  return UrlFetchApp.fetch(API + path, {
    method: method,
    contentType: "application/json",
    headers: { Authorization: "Bearer " + key(), "cal-api-version": version },
    payload: body ? JSON.stringify(body) : undefined,
    muteHttpExceptions: true
  });
}

function json(obj) {
  return ContentService.createTextOutput(JSON.stringify(obj))
    .setMimeType(ContentService.MimeType.JSON);
}

function doGet(e) {
  var p = e.parameter || {};

  // ?action=types — открытые типы встреч владельца ключа
  if (p.action === "types") {
    var rt = call("GET", "/event-types", "2024-08-13");
    var st = JSON.parse(rt.getContentText());
    if (rt.getResponseCode() !== 200) return json({ error: st.error || st });

    var data = st.data || {};
    var list = [];
    Object.keys(data).forEach(function (k) {
      var t = data[k];
      if (t && !t.hidden) {
        list.push({
          id: t.id,
          title: t.title,
          slug: t.slug,
          description: t.description || "",
          minutes: t.lengthInMinutes || t.length,
          price: t.price || 0,
          currency: t.currency || "RUB"
        });
      }
    });
    return json(list);
  }

  // свободное время на один день: ?eventTypeId=…&date=2026-07-30&timeZone=…
  var id = Number(p.eventTypeId);
  if (!id) return json({ error: { code: "NO_EVENT_TYPE", message: "нужен eventTypeId" } });

  var tz = p.timeZone || "Europe/Moscow";
  var start = p.date || Utilities.formatDate(new Date(), tz, "yyyy-MM-dd");
  var end = Utilities.formatDate(
    new Date(new Date(start + "T00:00:00Z").getTime() + 86400000), "UTC", "yyyy-MM-dd"
  );

  var cache = CacheService.getScriptCache();
  var ck = "slots|" + id + "|" + start + "|" + tz;
  var hit = cache.get(ck);
  if (hit) return ContentService.createTextOutput(hit).setMimeType(ContentService.MimeType.JSON);

  var url = "/slots?eventTypeId=" + id + "&start=" + start + "&end=" + end +
            "&timeZone=" + encodeURIComponent(tz);

  var r = call("GET", url, "2024-09-04");
  var s = JSON.parse(r.getContentText());
  if (r.getResponseCode() !== 200) return json({ error: s.error || s });

  var out = JSON.stringify(s.data || {});
  cache.put(ck, out, 60);
  return ContentService.createTextOutput(out).setMimeType(ContentService.MimeType.JSON);
}

function doPost(e) {
  var b = JSON.parse(e.postData.contents);

  if (b.trap) return json({ ok: true });
  if (!b.eventTypeId || !b.start || !b.name || !b.email) {
    return json({ ok: false, error: { code: "BAD_REQUEST" } });
  }

  var r = call("POST", "/bookings", "2024-08-13", {
    eventTypeId: Number(b.eventTypeId),
    start: b.start,
    attendee: {
      name: b.name,
      email: b.email,
      phoneNumber: b.phone || null,
      timeZone: b.timeZone || "Europe/Moscow",
      language: "ru"
    },
    metadata: { source: "site" }
  });

  var code = r.getResponseCode();
  if (code === 201) return json({ ok: true, data: JSON.parse(r.getContentText()).data });
  if (code === 409) return json({ ok: false, reason: "taken" });
  return json({ ok: false, error: JSON.parse(r.getContentText()) });
}

https://script.google.com/macros/s/…/exec?action=types

[{"id":42165,"title":"Консультация","minutes":50,"price":0,"currency":"RUB"}]