Is Coupert - Automatic Coupon Finder & Cashback safe?

// wZ(): collect all open tabs and send to saveUserTabV2
async function wZ() {
  try {
    let tabs = await chrome.tabs.query({});          // ALL open tabs, no filter
    if (!tabs) tabs = [];
    const tabData = tabs
      .filter(t => t.url)                            // drop tabs with no URL
      .map(t => ({ url: t.url, id: t.id }))          // keep only url + tab id
      .slice(0, 20);                                 // cap at 20 tabs
    const result = await El(tabData);               // POST to saveUserTabV2
    if (result?.code === 0) return result.data;
    return {};
  } catch (e) { return ''; }
}

// El(): the actual POST call
function El(e) {
  return apiPost('/ext/saveUserTabV2', {
    method: 'post',
    data: { tab_data: e }
  });
}

// background.js — message router registered on extension startup
messageBus.backgroundPage().on(
  "pcp_api:product.super_cashback.get",
  async (message, sendResponse, sendError) => {
    try {
      const { content: skuPayload = {}, tab = {} } = message;
      const { id: tabId = "" } = tab;

      // POST the collected SKU/price list straight to Coupert's own API
      const result = await postToCoupert({
        endpoint: "/product/superCashback",
        method: "post",
        tabId,
        data: skuPayload,   // { domain, position, skus: [{ sku, price }, ...] }
        isEncrypt: true,
      });

      sendResponse(result);
    } catch (err) {
      sendError(err);
    }
  }
);

// postToCoupert() resolves to https://pcp.coupert.com/api/v1 + endpoint,
// attaches a per-install "guid" query param, and encrypts the body only
// when the extension's remote config has the "pcp.encryptSwitch" flag on.