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Glossary8 min read

Ecommerce Operations Glossary: 30 Terms Defined

An ecommerce operations glossary defines the terms behind stock, orders, support, reports and subscriptions. Phantom stock is inventory your system counts as sellable but you can't ship. A reorder point is the stock level that triggers a purchase. WISMO means "where is my order." Below are 30 terms in plain English, plus checks you can run on your own store.

By Maksudur Rahman, FounderPublished Last reviewed

What we found

We built this for an online clinic, a Morsegrid client since April 2026. Source: its published case study, re-read on October 14, 2026.

Its weekly leadership brief pulls five feeds from source APIs: calls, program revenue, store revenue, CRM attribution and ad spend. Before anyone trusted the brief, it was reconciled against the founder's own tracking spreadsheet to the dollar.

That check is called reconciliation, and it has its own entry below.

Stock and orders

  • Phantom stock: Inventory your system shows as sellable but you can't ship. Typical causes are a miscount, a purchase order counted before it arrives, or stock held for another order.
  • On hand, committed and available: In Shopify, on hand is every unit at a location. It splits into committed (set aside for orders), unavailable (damaged or held back) and available (sellable).
  • Open purchase order: An order placed with a supplier and not yet received. Shopify treats it as incoming, not available, until received. Counting it as stock overstates what you can sell.
  • Reorder point: The stock level that triggers a new purchase. A common formula is average daily sales times lead time, plus safety stock.
  • Safety stock: Extra inventory held as a buffer against demand spikes and supplier delays. Shopify can hold it as unavailable stock, on hand but outside the sellable count.
  • Lead time: The days between ordering from a supplier and receiving the stock. Longer lead times push the reorder point up.
  • Overselling: Selling units you don't have. Causes include a wrong count, a sale landing before a sync catches up, and a product set to keep selling at zero stock.
  • Backorder: An order for an out-of-stock item, accepted on the promise of shipping when stock arrives.
  • Stuck order: A paid order that can't ship because something is missing, such as an item, an address fix or an approval. Without an alert, it can sit unnoticed.
  • 3PL: A third-party logistics provider that stores your stock and ships your orders. It keeps a second count of your inventory, which must reconcile with your store.
  • Inventory visibility: How accurately you can see stock across every channel and warehouse. In a December 2025 survey of 500 mid-market ecommerce retailers by Linnworks, an inventory software vendor, only 37.2% of US and 33.2% of UK respondents rated theirs excellent.

Support queue

  • WISMO: Short for "where is my order." Any contact asking about order status or delivery updates, by email, phone, chat or social. Count it by topic, not channel.
  • Ticket noise: Helpdesk tickets nobody is waiting on, such as your own order-confirmation emails landing in the queue. They inflate counts and bury real requests.
  • Auto-close rule: A helpdesk automation that closes tickets without a person reading them, usually by sender, subject or age. If it matches a real customer message, that customer gets silence.
  • Ticket deflection: Answering a request without a ticket, such as with a tracking page or help article. Check it against repeat contacts: a customer who writes in anyway was not deflected.
  • Missed call rate: The share of inbound calls nobody answers live. A helpdesk report often can't show it, because many unanswered calls never become tickets. Check your phone system's call log.
  • Callback worklist: A ranked list of missed calls and voicemails for a person to return, so no caller drops off. An entry clears when someone reaches the customer.
  • Hallucination: An AI answer that sounds plausible but is wrong or invented. Reduce it with approved facts to answer from, hard limits on what it may say, and human review where a mistake costs money.

Reports and numbers

  • Reconciliation: Checking that two sets of numbers that should agree do agree, such as a weekly report against the founder's own spreadsheet. A report that runs isn't a report that reconciles.
  • Source of truth: The one system whose number wins when two disagree. Without one, a sync between two systems can overwrite the right number with the wrong one. Our fulfillment automation playbook covers this for stock.
  • Attribution window: The days after an ad click or view in which a sale still counts toward that ad. Meta's standard settings include 1-day and 7-day click windows and a 1-day view window.
  • ROAS: Return on ad spend, meaning revenue credited to ads divided by ad spend. Tools with different attribution windows won't agree, so compare the platform's figure with your store's revenue for the same dates.
  • Silent failure: A job or integration that fails, or works wrongly, without raising an error. The dashboard stays green because it shows the job ran, not that the result was right.
  • Cohort retention: Of customers who started in the same month, the share still active after a set time or number of orders. Check it against a hand count of one cohort.

Subscriptions and wholesale

  • Voluntary churn: A customer chooses to cancel. Cancel reasons from your subscription app show which fix matters. One of our published case studies describes a churn report built from live Recharge data.
  • Involuntary churn: A subscriber is lost because a payment failed, not because they chose to leave. Expired cards and other payment-method problems are typical causes.
  • Dunning: Retrying a failed subscription payment and asking the customer to update their card, over a set window, before the subscription is canceled or paused.
  • Save rate: The share of customers who start to cancel and stay after a save offer. State the denominator, because customers who clicked cancel and customers shown an offer give different rates.
  • Draft order: In Shopify, an order you create by hand for a phone, email or wholesale sale and invoice with a checkout link. It becomes a regular order once paid.
  • Milestone reward: A reward earned after a set number of orders, such as a gift on a later order. Test it on a live charge, not only in your app's settings.

Check this in your own store

Each check uses data you already have and changes nothing in your store. Date every result so you can rerun it next month.

  • Phantom stock. In Shopify, open Products, then Inventory. Count the shelf units for your 10 best-selling variants and compare each with its On hand number. This is the method behind Shopify's Stock counts page, so write the gaps down before you adjust anything.
  • Open purchase orders. List supplier orders not yet received. If you track them in Shopify, their quantity should sit under Incoming, not Available. If your ERP or inventory app adds them to sellable stock, your store sells from too high a number.
  • Overselling. Open a few products and find "Continue selling when out of stock" in the Inventory section. If it's on, a zero count won't stop a sale. Decide whether that's a choice or an accident.
  • WISMO and ticket noise. Export last month's helpdesk tickets. Count the ones asking where an order is, then the ones sent by your own store, such as order confirmations. Divide each by the total.
  • Missed calls. Pull 30 days of your phone system's call log. Count inbound calls and calls answered live, then compare the unanswered count with your helpdesk's phone-tagged tickets.
  • Reconciliation and ROAS. For one week, write down total sales from Shopify, your payment processor and your books. Note each one's definition, such as gross or net. Then compare your ad platform's revenue with Shopify's and note the attribution window.
  • Churn. Export last quarter's cancellations. Split them into customers who chose to cancel and customers whose payment failed, and count each.

Where to go next

Want a first look before any call? The free 10-minute assessment gives you a personalized report. The ecommerce page lists the use cases we build for.

Sources

Frequently asked questions

What is phantom stock?
Phantom stock is inventory your system counts as sellable that you can't ship. To find it, count a sample of variants on the shelf and compare each with the On hand number.
What does WISMO mean?
WISMO stands for "where is my order." It covers any contact about order status or delivery updates, on any channel. Its share of your queue depends on your store, so count it from your own tickets, not an industry average.
How do I set a reorder point?
Multiply average daily sales by your supplier's lead time in days, then add safety stock. For example, 4 units a day, a 10-day lead time and 12 units of safety stock give a reorder point of 52. Review it when sales or lead times change.

A term only helps if you can check it. Start with the stock count, because orders, reorders and reports all draw on it. If you want a second pair of eyes on your own store, book a diagnosis call.

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