Yahoo! JAPAN Ads Script | Developer Center

function getAllMccAccounts() {
  const managerAccountId = AdsUtilities.getCurrentAccountId();
  const accountLinks = Display.AccountLinkService.get({
    mccAccountId: managerAccountId,
  }).rval;
  if (accountLinks.totalNumEntries == 0) {
    Logger.log('accountId does not exist.');
    return;
  }
  for (let i = 0; i < accountLinks.values.length; i++){
    let accountLink = accountLinks.values[i].accountLink;
    Logger.log('accountId-> ' + accountLink.accountId 
      + ', ownerShipType-> ' + accountLink.ownerShipType);
  }
}