Working With Products in Transactions
Adding products to a customer’s transaction is straightforward. Below is a step-by-step guide on how
November 10, 2025Welcome to , we’re so glad you’ve chosen our POS for your store! This article will guide you through the basics of using our Front End, the POS Register itself. Take a look at how easy ringing up a transaction can be!
Here is what you'll learn:
When you click to log into the POS, the initial load screen will show you your progress, and then you'll see the login screen, as pictured below. If you are starting a new shift, you can click the Clock In / Out button and a window will allow you clock in with your Cashier ID. If you are an administrator, enter your login PIN and either click the Sign In button or hit your Enter key.

Congratulations! You're ready to ring up products and complete transactions for customers.
Your initial system view looks like this:

In order to run transactions, you'll need to scan products into the Front End. Use your handheld scanner or integrated scanner / scale to scan the product's barcode. Items you scan will appear on your screen as you go, and each will have a line item in the register area. If there is special deal pricing based on the quantity of an item, the system will automatically apply it as soon as as soon as you have added the quantity threshold to the Register.

Once you scan, if the item is in the system, it will appear as a new line item in your register screen:

If the item is not in the system, it won't scan. There are two ways to move forward to add the item to the sale:
Non Scan — You can enter the item's price (as you enter the price, you'll see it in the blank field in the upper left of the POS window), then click or tap the Non Scan button on the far right of your screen, as pictured below.

The Department window will open and you can click on the appropriate Department for the item. Departments must be set to be eligible to have non-scan items in order to be selected here. You can use the Next and Previous buttons to navigate if you have multiple pages of departments.

Once you select the department, you'll be prompted to enter a product description if the Department has been set to be Open in the Back End. You can only enter products this way into an Open Department. Enter the name of the product as in the example below, then click or tap the OK button. If you need an on-screen keyboard, tap the Keyboard button.

Once you have entered your Non Scan item, its line item will appear in the transaction, as pictured here.


Add Product — If you have Manager permissions, you can click or tap the Manager Functions button and a window will pop up with your options. Click or tap the Add / Edit Product button, as pictured above. You are able to enter the following information:


From time to time you will need to Void items out of the transaction. Sometimes the customer will decide they don't need it, or there might have been an error on your part. Please note that once you void an item, you can't undo that action. If you need the item back in the transaction, you will need to add it to the Register again. You can void an item using the following steps:



If you need to cancel a transaction for whatever reason, click or tap the Cancel Transaction button on the right, as pictured above. If you accidentally click or tap this button, you will need to restart the transaction again. Once you click or tap the button, you will still see the transaction line items for reference, but the Item Count in the lower left will become zero. You'll be offered receipt options as pictured below. Those options are described below in the section on Completing a Transaction.

Once you have entered all of the items for a sale, you can proceed to the payment step. Start by clicking or tapping the Total button in the upper right.

On the right side of the Front End, you'll see payment methods the customer can use for the transaction. Depending on the size of your display, you might need to use the Next button in the lower right to see other options. The customer can pay with multiple methods if the first method doesn't cover the total for the transaction. Click or tap on the first method they want to use. In our example, the customer will pay partially by cash and partially by card, but descriptions for all payment types are listed below.

After we click or tap on the Cash button a window will open with single-click cash amounts on the left side that are appropriate for the transaction, including exact change. In this case, we will manually enter ten dollars since the customer is paying a partial amount. Then we can click or tap the Enter or OK buttons.

You'll be taken back to the transaction, and the system will have updated it with the payment.

For the next payment, the customer will use their debit card, so we click or tap the Debit button on the right. The system will assume that you're charging the full remaining total for the transaction, so it will open a window showing the remaining amount. If the customer is paying the full remaining amount with the card, as in this example, click Yes. If the customer is paying a partial amount with the card, click No, and you'll be able to set the amount (not pictured, but just like the cash amount entry window above).


If you click or tap the Yes button, you'll see a Change Due notification ($0 in our example). Once you click or tap to confirm you'll be offered the following Receipt options:

Your transaction is now complete. It will remain on-screen for a short while for reference, if needed. You can start a new transaction at any time by adding items or a customer.
Payment Methods include the following:


You'll occasionally need to do refunds on purchases for whatever reason, and the makes it easy for you. Start by clicking or tapping the Refunds & Voids button on the right, as pictured above.

Click or tap the Refund button on the right. You'll see 'RF' in the item scan field in the upper left. You can scan in the item, find the item using Product Lookup, or weigh the item if you're using a PLU. This will add the refund as a line item to the Register, as pictured here:

You can then click or tap the Total button in the upper right to choose the payment type for the return. If you're returning to a card, choose Debit or Credit. If you're using integrated Payments, the customer will be prompted to insert, swipe, or tap their card to receive the funds. Otherwise, you will manually need to process the return to their card on a terminal that is not integrated with the system.
Working With Products in Transactions
Suspending and Resuming Transactions
Refunds and Returns in the Register
Q: Can multiple cashiers log into the same register at the same time and just switch off as needed?
A: No. Only one cashier can be logged into the system at a time.
Q: I have a question, but I can't find my answer here. How do I get more assistance?
A: If you need immediate assistance, the team is available 24/7. Feel free to contact our support team at: 877-752-0625. Or you can email us at support@marktpos.com and we will respond within 24-hours.
Adding products to a customer’s transaction is straightforward. Below is a step-by-step guide on how
You can ring up a product as a Non-Scan item if it doesn’t have a UPC / PLU code or it's not yet reg
The system enables you to run transactions paid for with EBT, commonly known as Food Stamps or SNAP.
Can't quite find the answer you're looking for? Our support team is just a call away.
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