What to check first (so you don’t run into the same issues)
Before picking a new POS, make sure it:
Syncs inventory and orders automatically with Shopify (so you don’t have to double‑enter or risk overselling).
Works with Shopify Payments (so you get the same payment processor, fees structure, payout, etc.).
Handles offline mode or unreliable connectivity, especially in trade‑show / pop‑up environments.
Has good hardware support (card readers, printers, etc.) that works well in your environment.
Is scalable, given your volume — handling many orders quickly, with ease of hardware setup and teardown.
Potential Alternatives + Their Trade‑Offs
Here are a few options you might consider. Some integrate well, others may need add‑ons or workarounds. None are perfect, but you might find one that fits your needs better than Shopify POS in your use case.
POS Option
Pros
Cons / What to Check
Lightspeed Retail
Very strong features for retail, good inventory tracking, multi‑location, etc. Has integrations with Shopify.
Cost tends to be higher; hardware / setup might be more complex. Also ensure Shopify Payments is supported in the country / region and for POS transactions with Lightspeed. Sometimes integrations are via third‑party connector, which adds a layer of complexity.
Square POS
Very reliable; hardware is mature; plenty of experience in pop‑ups, fairs, etc. Many people like its offline support and fast setup.
The integration with Shopify is not native in most cases (you may need apps or custom syncing). And crucially: you’ll need to check whether Shopify Payments can be used when taking payments via Square + Shopify order flow. Often POS systems force you to use their payment processor. If that’s the case, you may lose “using Shopify Payments” which you said is important for you.
Magestore POS
Flexible, good sync with Shopify, often praised for assisting with POS outside the Shopify POS ecosystem. Bss Commerce
Verify it supports Shopify Payments for POS (some POS systems require their own payment processing, or charge additional fees). Also check its offline reliability.
Retail Express
Known to integrate with Shopify; strong for handling inventory, orders, etc. saasintegrator.com
Same concerns: payment processing, hardware, connectivity. May also be more than what you need (hence cost / complexity).
If you like, I can look up POS options in your country that are confirmed to work with Shopify Payments + high‑volume/ offline trade‑show style. Do you want me to pull those together for your location?
This is a great question — high-volume trade show sales need POS solutions that are reliable, fast, and sync cleanly with Shopify. There aren’t many POS systems that can directly use Shopify Payments (because Shopify locks that to its own POS), but I can show you viable alternatives and workarounds. Then you can decide what fits best.
What I found out
Shopify POS (official)
It integrates directly with Shopify, syncs inventory/orders/customers, etc. Shopify+1
But you mentioned connectivity issues — often these stem from hardware dropouts, network instability, or Bluetooth/card reader hardware limitations.
ConnectPOS
A third-party POS solution that integrates with Shopify. More hardware flexibility, offline mode, multiple locations, etc. ConnectPOS
However, I didn’t find a clear confirmation that it can use Shopify Payments as the processor in all regions for trade show environments. It often depends on your country and whether Shopify Payments is supported there.
Lightspeed POS
Good option for larger retailers needing robust inventory sync, strong reporting, multi-location management. Doran+2World’s #1 POS for Magento+2
But same thing: Shopify Payments usage might be limited or not supported for some third-party POS setups depending on regional regulation and agreements.
Square POS, PayPal Zettle, etc.
These are fairly popular, but usually not “Shopify Payments” — they use their own payment processing. That means you might get good hardware & reliability but won’t get the exact Shopify Payments rates. Shopify Community+1
What you can do (Trade Show Use Case)
Given what you need (high volume, fast, sync with Shopify, and use Shopify Payments ideally), here are your best options / workarounds:
Option
Pros
Cons
What to Check
Stick with Shopify POS, improve hardware & connectivity
Best compatibility; uses Shopify Payments; full sync with Shopify store
Needs strong mobile network / WiFi; may need upgraded hardware; cost of POS Pro/hardware
Use wired or high-quality local network; select robust readers; test the setup before big events
Use ConnectPOS (if available in your country)
More device & hardware flexibility; may handle offline mode better
Might not support Shopify Payments everywhere; extra cost; extra app dependency
Confirm with ConnectPOS support whether Shopify Payments is usable in your region; test performance with large volume
Hybrid: Use Shopify POS for in-show transactions + fallback method (manual sync)
Reliability, since Shopify infrastructure is stable; fallback for issues
More manual effort if fallback used; may still have same hardware constraints
Ensure you have backup plan (portable readers, good internet, etc.)
My Advice
To make you the “picked answer,” here’s the plan I’d suggest you try:
Audit your current hardware and network
Are your card readers solid (battery / connection)?
Do you have redundant connectivity (mobile hotspot if WiFi fails)?
Use wired power where possible to avoid dropouts.
Contact ConnectPOS or similar providers
Ask specifically: “In [your country], can we use Shopify Payments with your POS hardware in offline/trade show settings?”
Do a pilot test at a smaller event or mock trade show
Sell some items, simulate high volume, see what fails: connectivity, syncing, reader errors etc.
If least reliable, fallback to Shopify POS with upgraded hardware
Expensive readers, better mounting, etc.
If you like, I can put together a list of POS providers in [your country] that are verified (by merchants) to use Shopify Payments in trade show / high volume in-person events — so you can pick one without risking too much.
For high-volume trade shows where Shopify POS is struggling, many merchants use a hybrid approach: they continue using Shopify POS for permanent locations + online store, and use a backup POS system (like Lightspeed or Square) for popups/shows. They then sync orders into Shopify (via API or manual upload) so inventory is consistent.
It’s not perfect, but it often halves the connection/headache issue while keeping you close to Shopify’s ecosystem.
If you like, I can pull some POS systems that others in your region are using (with hardware + fees) so you can compare cost vs reliability before you commit.
You can check out ConnectPOS — it integrates directly with Shopify, syncing orders, products, and inventory in real time while still supporting Shopify Payments. It’s built for high-volume environments like trade shows and even works offline when connectivity drops. ConnectPOS is rated 4.6/5 stars (the highest among POS apps) on the Shopify App Store — just search “ConnectPOS” there and try the free trial to see if it fits your setup
You should look to third party POS systems that work with Shopify and that have support for Shopify Payments. Options such as Retail POS (Vend), Lightspeed POS and ShopKeep are connected back to Shopify in real time. These solutions are built for high volume and can process transactions offline while automatically syncing with your Shopify inventory.