Once the overnight file is the only thing joining them, a WooCommerce shop is always selling against yesterday, and reading what the IBM AS/400 already makes available is what closes that gap.
An IBM AS/400 has been holding the stock and the prices since long before the business had a website, and it does that job well. What it was never asked to do is answer a shopper who wants to know whether something is in stock right now. The usual bridge is a file produced overnight, which is accurate at breakfast and decreasingly so for the rest of the working day. Connecting WooCommerce and IBM AS/400 lets the shop read what the machine already makes available when it needs it, so the figure on the page is the figure the warehouse is working to.

A WooCommerce product reflects the position the IBM AS/400 holds now rather than the one it held at the overnight run, so the shop stops selling things that went this morning.
The overnight file and the person who checks it in the morning are no longer the mechanism, so a late run stops being the reason a shop spent a day selling the wrong thing.
A WooCommerce order reaches the IBM AS/400 as data rather than as something read off a screen and typed at a terminal, which is where the transposed digits used to come from.
Whoever looks after the IBM AS/400 decides what it makes available, and Alumio works within that, so the WooCommerce shop is served from what that machine already offers.
When a shopper opens a WooCommerce product, the position comes from what the IBM AS/400 makes available rather than from a copy taken hours earlier, so an in-stock message means something on the day it is read.
When an order is placed in WooCommerce, Alumio writes it into the IBM AS/400 against the item it refers to, so the warehouse picks from the same place it has always picked from rather than from a printed sheet.
When a trade customer signs in to WooCommerce, the price band the IBM AS/400 holds against their own account is the one they are shown, so the figure quoted online matches the one on the invoice sent afterwards.
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Count the places a delivery is currently recorded and the answer is usually two: the AS/400 says it left, and a driver's app says somebody signed for it. Neither knows the other. That is the third connection worth making, because the question a customer asks is the one neither can answer alone. Alumio holds it alongside this one and reuses the same order reference.
Yes, and the choice is between reading on request and keeping a copy refreshed. Reading on request is the honest figure and costs a call each time; a refreshed copy is faster and is only as good as its last refresh. Alumio can do either, or both for different things, on the schedule you set. What can be read is whatever the AS/400 makes available.
No. The manual step this removes is the order printed off and rekeyed at a terminal, and what replaces it is a mapping between a WooCommerce field and what the older system holds, kept as configuration rather than as a program. Where a layout on the older side will not map as it stands, the Code Transformer converts it at that one step.
The answer to a question asked at two in the afternoon. A file is a photograph of the morning, and every sale taken between the run and the moment a shopper looks is a difference nobody can see. Reading what the AS/400 already makes available at the point the page is built means the figure is current, and for a business selling from one pile of stock that is the difference between a sale and an apology.
The confusing one is an order the older system accepted and then refused on its content, because the shop has already taken the money. Alumio names what the AS/400 would not take and the reason it gave, so the fix is a known thing rather than an investigation. Each transfer is monitored live and logged with what it carried, alerts go out at once, retries run where configured, and nothing is lost silently.
Talk to an Alumio integration specialist. We'll map the right architecture for your systems, at the right scale, so your operations stay reliable through every change.