如何在for循环中调用promise？

Question

我有一个返回承诺的函数（getCustomer函数调用REST API从数据库中获取客户信息）。我还有一个要遍历的客户ID数组，对于每个客户ID，我想调用REST API函数以获取其他客户信息。

当我在for循环中调用函数/承诺时，它总是一遍又一遍地返回客户的第一个值。这是因为在执行Promise之后循环仍在继续吗？我该如何解决？

这是我的代码，调用promise函数：

oauthClient.makeApiCall({
    url: url + 'v3/company/' + result.companyId + '/reports/CustomerBalanceDetail'
  })
  .then(function(balanceDetails) {
    var balanceDetails = JSON.parse(balanceDetails.body).Rows.Row;

    //only return details if some invoices exist
    if (balanceDetails.length > 1) {
      var overdueInvoices = [];
      var today = new Date();

      //loop through all customers
      for (var i = 0; i < balanceDetails.length; i++) {
        if (balanceDetails[i].Header != undefined) { //only loop through the rows which are not the summary
          var headerInfo = balanceDetails[i].Header.ColData;
          var invoiceInfo = balanceDetails[i].Rows.Row;

          //get the customer phone and email based on their id - call REST API to get customr details
          getCustomer(senderId, headerInfo[0].id).then(function(result) {
            var customerInvoices = {
              "customerName": headerInfo[0].value,
              "customerId": headerInfo[0].id,
              "customerPhone": result.phone,
              "customerEmail": result.email,
              "invoices": []
            }

            //loop through all invoices for each customer and add them to the customer invoices list - this is to exclude payments and not overdue invoices
            for (var j = 0; j < invoiceInfo.length; j++) {
              //Loop through all invoice and log them to console
            }
          }, function(err) {
            console.log(err);
          });
        }
      }

      var response = {
        "text": "",
        "overdueInvoices": overdueInvoices,
      }

      resolve(response);
    } else {
      var response = {
        "text": "You do not have any overdue invoices. Good job collecting!",
        "overdueInvoices": null,
      }

      resolve(response);
    }
  })
  .catch(function(e) {
    console.error(e);
    reject(e);
  });