Lebaran is days away, THR is landing in bank accounts across the country, and Indonesian online sellers are heading into their biggest sales window of the year. Ecommerce peak season preparation is the difference between a record week and a week of angry chats, cancelled orders, and refund requests you will be processing until June.

I have watched this movie every year. The traffic spike itself is rarely what kills a store. What kills it is the pile-up of small failures: a checkout that slows down under load, stock counts that drift out of sync across channels, a courier cutoff nobody checked, and a WhatsApp inbox with 300 unanswered messages by day two.

The good news is that peak season preparation is not a technology project. It is a checklist. If you sell online, whether through your own site, Tokopedia, Shopee, or WhatsApp, here is the one I run with clients before every Lebaran.

Stress-test the path to payment

Your homepage can survive slow. Your checkout cannot. Every second of delay at checkout during peak season is abandoned carts, and shoppers with THR in hand are not patient.

If you run your own store on Shopify, WooCommerce, or a custom build:

  • Test checkout under load, not just uptime. Uptime monitors tell you the site responds. They do not tell you that checkout takes 12 seconds when 200 people hit it at once. Run a basic load test against the full purchase flow, or at minimum have five people complete real orders simultaneously on payday evening traffic patterns.
  • Check your payment gateway limits. Some gateways throttle or flag sudden volume spikes as fraud. Email your provider now and tell them you expect 3 to 5 times normal volume. It is one message and it prevents a very bad day.
  • Turn off anything non-essential. That heavy homepage slider, the third-party review widget that loads slowly, the popup you installed last month. Every external script is a dependency that can drag your site down at the worst moment.

If you sell mainly through marketplaces, the platform handles the load. Your bottleneck is everything after the order lands, so read on.

Get honest about stock, then buffer it

Overselling is the classic Lebaran failure. It happens because stock lives in three places at once: the marketplace listing, your own store, and the physical shelf. During normal weeks the drift is small enough to absorb. During peak week it is not.

  • Do a physical count of your top 20 products this week. Not the whole catalog, just the items that will carry 80 percent of your Lebaran revenue. Reconcile every channel to the counted number.
  • Hold back a buffer. If you have 100 units, list 90. The 10-unit buffer absorbs sync delays, damaged items, and the picking mistakes that happen when your team is packing at double speed.
  • Decide your out-of-stock behavior now. Will you allow pre-orders with a stated ship date after Lebaran, or hard-stop sales? Either is fine. Deciding mid-rush, per angry customer, is not.

One food gift seller I worked with in Tangerang lost roughly Rp 40 million in a previous Lebaran, not from missed sales, but from refunds and shipping costs on oversold hampers plus the marketplace penalty points that suppressed their listings afterward. The buffer rule alone would have prevented most of it.

Know your courier cutoffs to the day

Every logistics provider publishes Lebaran service schedules, and they all reduce or pause pickups around the holiday. Yet every year sellers accept orders on the last possible day and promise delivery "before Lebaran" that physically cannot happen.

Do this today:

  1. List every courier you use and find their last pickup date and last-mile guarantee for your main destination cities.
  2. Work backward: if the courier's realistic last safe pickup is three days before Idul Fitri, your last order cutoff for "arrives before Lebaran" is a day earlier than that, because packing takes time too.
  3. Publish the cutoff everywhere. Store banner, product descriptions, marketplace notes, WhatsApp auto-reply. A clearly stated cutoff turns a complaint into a non-event.

Also decide whether you keep selling after cutoff with honest post-Lebaran delivery dates, or pause the store. Many sellers do better pausing for a few days than absorbing the support load of confused buyers.

Pre-write your customer service before you need it

During peak week your team will answer the same eight questions hundreds of times. Writing the answers in real time, one thumb-typed reply at a time, is how inboxes die.

Prepare canned replies now, in Bahasa Indonesia, saved as WhatsApp Business quick replies or a shared document:

  • Order confirmation and estimated ship date
  • "Where is my order" with tracking-check instructions
  • Last order cutoff for pre-Lebaran delivery
  • Out-of-stock apology with alternative products
  • Payment confirmation received
  • Holiday operating hours
  • Refund and exchange policy during the holiday period
  • Post-Lebaran resumption date

Set your WhatsApp Business greeting and away messages with the cutoff date and response-time expectation. A buyer told to expect a reply within 6 hours is calm. A buyer hearing silence assumes the worst. If your order volume on WhatsApp is becoming its own operational problem beyond canned replies, that is a solvable systems problem, one I will cover separately in how a distributor turned WhatsApp chaos into an ordering system.

Staff the surge, protect the holiday

Peak week is also the week your team wants to mudik. Plan the roster now: who packs, who answers chats, who handles payment reconciliation, and on which days. Even a two-person operation benefits from writing this down. Decide which days you are genuinely closed, and honor them. A burned-out seller making mistakes on day four costs more than a day of paused sales.

If cash allows, a temporary helper for packing at Rp 150 to 200 thousand per day during the three heaviest days is one of the highest-ROI spends of the season.

The takeaway: run the checklist this week

Peak season preparation compresses to five moves: stress-test checkout, buffer your stock, publish courier cutoffs, pre-write your replies, and roster your people. None of it requires new technology. All of it requires doing it before the rush, because during the rush you will only have time to execute.

Block two hours this week, run the list, and write down what broke or nearly broke. That note becomes your head start for Harbolnas and next year's Lebaran, and it is the seed of a real technology strategy instead of an annual scramble. Selamat berjualan, and may your packing table be busy for all the right reasons.