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PAX A920 Pro Setup Options: Payment Terminal or Mobile POS - (Discontinued)

Learn the differences between using a PAX A920 Pro as a payment terminal connected to a POS register and using it as a fully mobile POS device running Sharper Mobile POS.

The PAX A920 Pro can be used in two different ways within SharperMMS:

  1. Register Mode (Card Reader Only) – The POS register runs on a computer, tablet, or browser, and the PAX device is used only to collect payments.

  2. Mobile POS Mode (Register on Device) – The POS register runs directly on the PAX device, allowing staff to create sales, add items, and process payments from the handheld unit itself.

The setup process and daily workflow differ depending on which mode you choose.

NOTE: This article is for marinas that already use a PAX A920 Pro device. New POS setups use a standard Payroc card reader connected to the SharperMMS POS Register — a PAX device is not required.
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For marinas with an existing PAX A920 Pro, the device can be used in two ways:

  • As a payment terminal connected to a traditional SharperMMS POS Register

  • As a fully mobile POS register running Sharper Mobile POS directly on the device.

Option 1: Register Mode (PAX as a Card Reader)

Best For

  • Front desk or ship store registers

  • Fixed checkout stations

  • Users who want the full POS interface on a larger screen

How It Works

The SharperMMS POS Register runs on your computer or tablet, while the PAX device handles card payments.

⚠️ Important: Before processing payments, ensure the Payroc app is open and connected on the PAX device. Payments may fail if the Payroc app is closed or disconnected.

Workflow:

  1. Open the POS Register in SharperMMS.

  2. Add products or services to the sale.

  3. Select Pay in SharperMMS

  4. Choose the Device payment method.

  5. The payment amount is automatically sent to the PAX device.

  6. Customer taps, inserts, or swipes their card.
    ​If tipping is enabled, the customer will be prompted to select a tip amount on the device prior to paying.

  7. Payment is approved and returned to the main register screen.

  8. Receipt options are displayed in SharperMMS.
    ​

Advantages of Register Mode

  • Full POS experience on a larger screen.

  • Faster item lookup and navigation.

  • Ideal for stores with larger inventories.

  • Easier cashier training for traditional checkout environments.

Initial Setup

Before using the PAX device as a card reader, complete the following steps in SharperMMS. This setup is required for every PAX device, including the A920 Pro — even if it will also be used in Mobile POS Mode (Option 2 below).

Step 1: Enable Device Payments

On your computer or tablet in SharperMMS:

  1. Go to System Settings > Payment Methods.

  2. Enable Device Payment Methods. This setting is disabled by default, and must be enabled to allow device payments as well as to allow refunds for payments processed via the device.

Step 2: Add Your PAX Device

  1. Go to Company Settings > Payment Device.

  2. Click Add New.

  3. Select Payment Processor: Payroc.

Enter the following details:

  • API Key → Provided by Sharper Support

  • Terminal ID → Provided by Sharper Support

  • Device ID → Enter the serial number from the back of the PAX device

Step 3: Assign Device to POS Register

  1. Navigate to POS > Register.

  2. Open your register settings.

  3. Under Payment Methods, select the PAX device you want to use. You can assign multiple registers to a single device if needed.

Before Processing Payments (Important)

If you're setting up an A920 Pro to also run as a mobile register, continue to Option 2 below once these steps are complete.

For general register setup, see: POS Registers Overview

Option 2: Mobile POS Mode (Register loads on the A920 PAX Device)

Best For

  • Fuel docks

  • Marina yard operations

  • Boat rentals

  • Mobile retail sales

  • Staff working away from a traditional checkout counter

How It Works

The Sharper Mobile POS application runs directly on the PAX device.

⚠️ Important: Before processing payments, ensure the Payroc app is open and connected on the PAX device. Payments may fail if the Payroc app is closed or disconnected.


​Workflow:

  1. Open Sharper Mobile POS on the PAX device.

  2. Search for a customer or create a new sale.

  3. Add products, services, fuel, or inventory items.

  4. Complete checkout directly on the device.

  5. Customer taps, inserts, or swipes their card.
    ​If tipping is enabled, the customer will be prompted to select a tip amount on the device prior to paying.

  6. Transaction is processed immediately on the device.

  7. Receipt options are presented.

No separate computer or POS station is required.

Advantages of Mobile POS Mode

  • Completely mobile operation.

  • Process sales anywhere with Wi-Fi or cellular connectivity.

  • Ideal for dockside and field staff.

  • Eliminates the need to return to a register station.

Initial Setup

Before using the device as a mobile register:

Step 1: Configure the Device for Payment Processing (Required First)

Before the A920 Pro can process payments, it must be set up just like a standard PAX payment device — complete Step 1 and Step 2 under Option 1: Register Mode above. This ensures the device is connected to Payroc, its payment credentials are configured, and it's recognized by SharperMMS for processing payments. This step is required for all PAX devices, including the A920 Pro.

Step 2: Enable On-Device POS (A920 Pro Only)

Once you have set up the device within Sharper, you can proceed with linking a register to use on-device POS.
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On the PAX A920 Pro device:

  1. Open the Device Settings page on the A920 Pro

  2. Enter your Sharper subdomain. Example: yourmarina.sharpermms.com (this is the same URL you use to log into Sharper on a browser)

  3. Click Save

Step 3: Select Your Register

  1. Choose the appropriate Register(s) from the list. Only registers already set up in Sharper (web) will appear. A device can be assigned access to multiple registers — users select the register they wish to use when signing in.

  1. Log in just like you would on a normal POS register: enter your user PIN and clock in, if applicable.

Step 4: Connect the Payroc App (Required)

Before processing any payments:

  1. Open the Payroc app on the device

  2. Ensure it is connected to Payroc Cloud

⚠️ Important Note:

  • If the Payroc app is not open or connected, payments may fail

  • Always confirm connection at the start of the shift


​
↩️ How to Exit the Payroc App:

  • Tap the Payroc icon 3 times to reveal the navigation buttons

  • This is an intentional safeguard put in place by Payroc to prevent accidental exits during payment processing

💳 You are now ready to process payments for the day!

How To: Process Payments on the Device

  1. Create an order in Sharper on the device.

  2. When ready to charge, Sharper will automatically switch to the Payroc payment screen.

  3. If tipping is enabled, customer will be prompted to select a tip amount. Customer completes payment (tap, insert, or swipe).

  4. Once approved, the device returns to Sharper to complete the transaction and present receipt options.

Having trouble processing payments? Always verify that: the Payroc app is open, the device is connected to Wi-Fi, and the Payroc app shows a connected status. Payments may fail if the Payroc app is closed or disconnected.

⚠️ Notes on Refunds

Refunds cannot be processed on the device. All refunds must be completed in the full POS (web) or CRM tools in SharperMMS.

You're Ready to Go

Once setup is complete, your PAX A920 Pro can be used as a fully mobile POS register for creating sales and processing payments anywhere on-site.

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