Shopify Purchase Orders: How to Track Supplier Orders Properly

Shopify Does Not Have a Purchase Order System — Here Is What To Do Instead

This surprises many Shopify merchants: despite being one of the world’s most popular ecommerce platforms, Shopify does not have a native purchase order (PO) management system. There is no built-in way to send a PO to a supplier, track inbound shipments, receive goods against an order, or reconcile deliveries against what was ordered. For stores that restock from suppliers regularly, this is a genuine gap — and one that causes real operational problems if not addressed deliberately.

This guide explains why purchase order management matters, what the risks of doing it badly are, and how to build a reliable PO process on Shopify.

Why Purchase Order Management Matters

A purchase order is a formal record of what you agreed to buy from a supplier, at what price, in what quantity, to be delivered by what date. It creates accountability on both sides: the supplier knows exactly what was ordered, and you have a record to reconcile against when the delivery arrives.

Without a PO system, several things tend to go wrong. Stock is received without being counted against an expected order, so you never know if the supplier delivered everything. Prices are not verified against what was agreed, so overcharges slip through. Partial deliveries are not tracked, so you do not know that the second half of your order never arrived. Reorder timing is managed by gut feel rather than data, so you either run out or over-order.

Each of these gaps costs money and creates inventory data that cannot be trusted.

Option 1: Manage POs in a Spreadsheet (Small-Scale Approach)

For stores with a small number of suppliers and a limited catalogue, a well-structured spreadsheet can be a workable PO system. Create a PO log that records the PO number, supplier, product SKUs and quantities ordered, agreed price per unit, expected delivery date, actual delivery date, and any discrepancies noted on receipt.

The critical discipline here is updating Shopify’s inventory counts only after physically receiving and counting stock — not when the PO is placed, and not when the supplier ships. Updating inventory before goods are actually in your warehouse is one of the most common causes of phantom stock (Shopify says it is available, but it is still somewhere in transit).

The spreadsheet approach breaks down as volume increases. If you are placing more than a handful of POs per month, the manual reconciliation burden becomes unsustainable and error rates climb.

Option 2: Shopify Apps with PO Management

Several Shopify apps add purchase order functionality directly within Shopify’s admin interface. Stocky (Shopify’s own free app), Inventory Planner, and Cin7 are among the options that provide PO creation, supplier management, and receiving workflows.

Stocky, in particular, is worth evaluating if you want a no-cost starting point. It integrates directly with Shopify’s inventory system and allows you to create POs, send them to suppliers, and receive them against expected quantities — automatically updating your Shopify inventory counts when goods are marked as received.

The receiving workflow is the key feature to evaluate in any app. When you receive a delivery, you want to be able to scan or manually enter what actually arrived, compare it against what was ordered, flag discrepancies, and only update inventory counts for items that are physically confirmed to be in your warehouse.

Option 3: ERP Integration for High-Volume Operations

For larger Shopify operations — particularly those with complex supply chains, multiple suppliers, and high order volumes — a full ERP (Enterprise Resource Planning) system integrated with Shopify is often the right answer. ERPs like NetSuite, Cin7 Core, or DEAR Systems provide comprehensive PO management as part of a broader operational platform that also handles accounting, supplier relationships, and more.

ERP integration is a significant project — typically several months and a meaningful budget investment. It should be approached only when the benefits clearly outweigh the complexity and cost. The key trigger points that usually justify ERP investment are: more than 50 POs per month, complex multi-currency supplier relationships, the need to connect inventory data to financial reporting automatically, or regulatory requirements around stock documentation.

Building a PO Receiving Process That Protects Inventory Accuracy

Whatever system you use — spreadsheet, app, or ERP — the receiving process is where most inventory errors are introduced. Here is a reliable process to follow for every delivery:

• Pull up the original PO before touching the delivery
• Count every item in the delivery physically before recording anything
• Compare actual quantities received against PO quantities line by line
• Record any discrepancies — short deliveries, wrong items, damaged goods
• Update inventory in Shopify only for items confirmed received and in sellable condition
• Flag discrepancies to the supplier within the agreed dispute window
• File the delivery note against the PO record

This process takes time, but it protects your inventory data integrity. Cutting corners at the receiving dock is how “the system says 100 but we have 60” situations develop.

Reorder Point Automation: Moving Beyond Manual POs

Once your PO process is reliable, the next step is automating when to reorder. This means calculating reorder points for every SKU — the inventory level at which a new PO should be placed to ensure you do not run out before the next delivery arrives.

A basic reorder point formula is: (Average daily sales × Lead time in days) + Safety stock. If you sell an average of 10 units per day and your supplier takes 14 days to deliver, your reorder point is 140 units plus whatever safety buffer you choose. When your stock drops to that level, a PO should go out.

Some inventory apps can automate this calculation and even auto-generate draft POs when reorder points are hit. This removes human judgment (and human delay) from the reorder process and ensures you are consistently ahead of stock-out events rather than reacting to them.

The OneOnic Shopify team helps merchants build out supplier management workflows that connect PO tracking, receiving processes, and reorder automation into a coherent system. If you want help evaluating whether your current approach has gaps, get in touch for a free audit. See also our portfolio for examples of operational overhauls we have delivered.