Connecting your online store to inventory and POS systems
A customer buys a product from your store, and an hour later you call them to apologize because the product is sold out. This problem repeats at every store that sells both online and in a physical branch without a real link between the two inventories. The result is cancelled orders, angry customers, and time wasted adjusting numbers manually.
When do you need integration?
If you sell through one channel with a limited number of products, manual management may be enough for now.
You sell from one or more branches and online at the same time
You have a warehouse and a store updating numbers in Excel files
You cancel orders because a product is out of stock more than once a week
You sell through more than one channel (your store, marketplaces, and social media)
The golden rule: one source of truth
Choose one system that owns the stock number, and have the other systems follow it. When the same product has two numbers in two independent places, an error will happen at some point.
ERP or inventory system
It is the owner; the store and POS read from it and write to it.
Or the store is the owner if you don't have an ERP, and the POS connects to it
Sync methods
For fast-selling products, choose real-time sync. For stable products, periodic sync is enough.
Real-time via API or webhook
Pros: accurate numbers — Cons: requires careful error handling
Periodic (every few minutes)
Pros: simpler to build — Cons: overselling may happen in the gap
Manual (files)
Pros: no development needed — Cons: errors and delays
Reserve stock at checkout
Don't deduct stock only at shipping. When checkout starts, reserve the quantity for a set number of minutes: if the order completes, it is deducted permanently; if not, it returns to stock. This prevents selling the last item to two customers at the same moment.
Multiple branches and warehouses
Define each branch and warehouse as a separate location with its own stock
Set the fulfillment rule
Which location ships the order? The closest? The one with the most stock?
Show customers availability by their area if it matters (in-store pickup, for example)
Details many stores overlook
Product codes (SKU)
Standardize them across all systems from day one, or matching will be painful later.
Variants
Each color and size has its own stock.
Returns
Decide when a product goes back into stock (after a quality check, not immediately on arrival).
Low-stock alerts
A minimum for each product that notifies the purchasing team.
Periodic stocktaking
Compare the system number with reality, and record discrepancies and their causes.
When integration fails
Systems crash and networks go down. Design the integration to withstand that:
Queue failed requests and retry automatically
Make every operation safely repeatable (so stock is never deducted twice)
Alert the support team when failures repeat
Log every stock movement to trace any unexplained number
Metrics for integration success
Percentage of orders cancelled due to stockouts
Inventory accuracy
System versus physical count.
Time for an update to reach the store from the branch
Hours of manual work saved per week
Frequently asked questions
Do I need a full ERP to connect inventory?
Not always. An inventory system or POS with an API may be enough, and an ERP helps when purchasing and accounting get complex.
Should I show the remaining quantity to the customer?
You can show "only 2 left" to prompt the decision, but only if it is true, or you will lose trust.
How long does integration take?
It depends on the existing systems and the quality of their APIs, so an initial analysis is needed before promising any timeline.
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