What Is a PDQ Machine: Meaning, Types, and How They Work

Card payment devices are now a standard feature in almost every business, from large retailers to small independent shops. Often referred to as PDQ machines (short for “Process Data Quickly”), these tools have played a key role in the shift toward fast, cashless transactions.

In this article, we explore the origins of PDQ machines, explain how they process payments, and outline the different types available today. We also look at the advantages they offer to both businesses and customers in everyday use.

What Is a PDQ Machine?

A PDQ machine is an early term for the electronic payment terminals that paved the way for modern card machines. Although the phrase is now used less frequently, it still refers to the standard equipment businesses use to accept card payments.

These machines enable transactions via credit and debit cards, supporting chip and PIN as well as contactless methods. 

In practice, a PDQ machine functions much like any contemporary card terminal, facilitating secure, efficient payment processing at the point of sale.

What is a PDQ payment?

A PDQ payment occurs when a customer uses a prepaid, debit, or credit card on a card reader or POS device.

The payment is processed when the customer swipes the card’s magnetic stripe, inserts the chip and enters a PIN, or taps the card on the terminal for a contactless transaction.

How does a PDQ machine work?

There is little that differentiates PDQ machines from credit card machines in terms of payment acceptance.

The process can be narrowed down to four steps:

1. Card entry – The customer enters their debit or credit card into the PDQ machine after they have entered the payment amount for the purchase in question, say a cup of coffee.
2. Data transmission – An authorisation request is sent from the terminal to the acquirer or processor, then via the card network to the issuer.
3. Approval – If the customer’s account has sufficient funds, authorisation is granted.
4. Completion – Finally, the funds are transferred from the customer’s account to the merchant’s account. While this can usually take days, some providers, like myPOS, provide instant funds settlement.

From an operational perspective, reliability and speed at each stage are critical. Transaction latency, network stability, and terminal configuration can all affect approval times and customer experience. 

Businesses should also be aware of factors such as interchange fees, settlement timelines, and PCI compliance requirements, as these directly impact costs, cash flow, and data security.

Who Is Involved in a PDQ Transaction?

When a customer uses a PDQ machine, the transaction may feel instant, but behind the scenes, several key players work together in a tightly coordinated process. 

Let’s break down the four main entities involved in every PDQ transaction:

• The acquiring bank – often called the merchant bank, this is the financial institution that enables the business to accept card payments. The acquiring bank receives transaction requests from the payment processor and communicates with card networks. It also deposits the approved funds into the merchant’s account.
• The issuing bank – the bank that issued the customer’s debit or credit card. It verifies that the card is valid, checks whether sufficient funds are available, assesses potential fraud risks, and approves or declines the transaction.
• The card network – the central communication hub that connects the acquiring and the issuing banks. Card networks like Visa and Mastercard route transaction data between banks, set rules for payment processing, and ensure that security protocols are followed. 
• The payment processor – manages the real-time movement of transaction data. It captures card details from the PDQ machine, encrypts and securely transmits data, and sends the transaction request to the acquiring bank.

All of these parties are essential when it comes to achieving hassle-free payments using PDQ machines.

What Payment Methods Can a PDQ Machine Accept?

A PDQ machine can handle various card payments, contactless payments, and mobile payments made through digital wallets such as Samsung Pay, Google Pay, or Apple Pay.

Overall, the three main payment types are:

• Chip and PIN: PDQ machines accept chip payments, meaning that once the transaction has been initiated, the customer needs to insert their credit or debit cards with the chip facing upward and forward into the machine for the machine to read it. 
• Contactless payments (NFC): Customers who seek to make contactless card transactions, which involve merely hovering or tapping their card above to process data quickly; card machines can also enjoy this functionality for faster payment processing. These machines can accept contactless payments in a streamlined and secure way, offering customers greater peace of mind.
• Mobile payments: Mobile payments are payments made with digital wallets. The customer’s credit or debit card is preloaded and stored on their smart mobile phones. Once the transaction is ready to proceed, the customer simply opens their app and hovers their phone above the PDQ card machine. The communication process begins.
  
  Card payments are usually processed in seconds. The issuer communicates with the customer’s card provider to determine if there are sufficient funds in their bank account. After this, bank authorisation takes place, and funds are transferred.

Types of PDQ Machines Explained

The types of PDQ machines can be split into two main categories – by business setup and by technology level. 

Here’s everything you need to know about each one.

By business setup

Based on the business setup, PDQ machines can be countertop, portable, and mobile. 

Countertop

Countertop PDQ machines are typically positioned on or near the merchant’s counter in a physical store. They are usually connected via a fixed internet connection and are sometimes plugged into a power outlet. 

In such cases, when a customer seeks to make a payment, they are guided to the merchant’s checkout, where the card machines are positioned, and then proceed to make a payment.

Portable

Portable PDQ machines accept Chip&PIN, contactless, and mobile payments. They are not physically connected to a countertop with wires or cables and can be moved around. 

Examples of businesses that use them include coffee shops and restaurants, where customers don’t have to physically go to the portable PDQ machine to pay. Instead, the reader is brought directly to the customer. They tend to work with a Wi-Fi signal. 

Mobile

A mobile PDQ card reader is a highly versatile means of accepting payments. Mobile PDQ machines enable merchants on the go to accept card payments through their smart mobile devices. 

Credit and debit card payments are streamlined as using a mobile PDQ machine facilitates ease of access and offers greater mobility, thus streamlining the payment process for both merchants and their customers.

By technology level

On the other hand, depending on the required technology level, these machines can be traditional devices, smart devices, or smart apps. 

Traditional devices

Traditional PDQ or card payment devices usually have a physical keypad for entering amounts. 

While some print receipts, others are paper-free and can send the customer a receipt via email or SMS.

Smart devices

Android-powered debit and credit card machines are another noteworthy investment for merchants who are looking for a more sophisticated solution to their payment needs.

These devices usually have a touchscreen and connect to various apps, which makes payment acceptance more seamless. Based on the customer’s needs, they can also provide paper or digital receipts.

Smart apps

Innovation in the global payments landscape now allows merchants to accept payments directly on Android smartphones through apps..

With this app, which requires no additional cables, dongles, or hardware, both merchants and customers can have a seamless payment experience. Payments are processed immediately, so this solution is ideal for merchants on the go who can accept payments anytime, anywhere. 

How much does a PDQ machine cost?

The cost of a PDQ machine isn’t limited to the purchase of the device itself. It’s, therefore, important to separate hardware costs from ongoing transaction fees.

Hardware costs

Whether you use a traditional or a smart PDQ machine, more features increase costs. Android smart devices offer apps for inventory management, QR scanning, and long battery life, among other functions.

Naturally, prices vary based on features and functionality. Basic PDQ machines are typically more affordable, while smart PDQ terminals come with added capabilities, making them more expensive. These machines can go from as little as 29 GBP and reach a price as high as 249 GBP. Buying a PDQ machine from myPOS also comes with a 1-year free warranty.

Alternatively, some businesses choose to lease a PDQ machine, which spreads the cost into manageable monthly payments. 

Transaction costs

Beyond the hardware, every PDQ transaction comes with a processing fee. These fees are charged per transaction and can vary dramatically based on factors like the type of card used, the card network, whether it’s a domestic or international payment, and your payment provider’s pricing structure. 

In most cases, the transaction rates are a small percentage of each sale, but can also be combined with a fixed fee per transaction. 

Advantages of Using a PDQ Machine

Most merchants these days opt for PDQ machines simply because consumer trends indicate that they would like to pay in a safer and more convenient way.

The advantages of PDQ machines for merchants can be categorised into operational, financial, and customer experience:

• Operational – fewer cash-related errors, accepts all types of payments;
• Financial – affordability, instant settlements of funds;
• Customer experience – secure transactions, meets modern customer expectations.

Let’s dive deeper into each one. 

Secure

PDQ machines comply with the highest industry standards, minimising the potential for fraudulent transactions. A PDQ terminal encrypts data or tokenises it, keeping risks related to financial information theft lower and guaranteeing secure payments.

This makes it rank high among the safe payment options available to merchants and customers. 

Affordable

Merchants who are looking for budget-friendly PIN card payment terminals can take advantage of affordable traditional PDQs, going from as little as 29 GBP. 

As mentioned earlier, small businesses in the UK can also choose low monthly rental options as an alternative. 

Fewer cash-related errors

Cashless payments reduce the risk of errors, theft, and fraud linked to handling cash. 

When you accept less cash and process more card transactions, you can track receivables more easily and access stronger reporting and analytics.

Instant settlement of funds

Payment service providers such as myPOS give merchants instant access to funds through a free online merchant account. This account differs from a business bank account. It includes a free IBAN and a Standard Visa business card.

You can also manage business expenses more effectively, as there are no monthly fees when you purchase a modern PDQ machine.

Make sure to check with your payment service provider to confirm whether you can expect instant or next-day settlement of funds. 

Accepts various types of payments

PDQ machines today accept various types of payments, from contactless to Chip&PIN and Magstripe. In addition, they accept digital wallets, thus offering customers greater choice and convenience when making payments.

This is incredibly important, as contactless debit and credit card payments are expected to represent around 45% of all payments made in the UK by 2033.

As a business, this means that you can rest assured knowing that you can accept major cards preferred by your customers.

Meets customers’ expectations

Customers today are looking for a secure, hassle-free payment experience, and paying with their cards is becoming the norm in many European societies. 

A secure and easy-to-use card payment machine simplifies transactions. It improves convenience and increases customer satisfaction. As a result, you can expect more positive reviews and happier shoppers.

How To Choose the Right PDQ Machine For Your Small Business

Your choice of a PDQ reader should depend on factors such as:

• The type of business you run. For example, if you’re at a fixed location, you can use a countertop PDQ reader, while if your business is primarily on the go, a mobile machine could be more useful.
• Cost will also play an important role, based on your affordability levels.
• You also need more convenience for your business, such as instant access to your received funds. Not all providers offer this option, so choose your provider carefully.
• You need to process payments of different types, be they contactless, Chip and PIN, or through a digital wallet. Ensure that your PIN machines offer this functionality.
• Accept credit and debit card payments easily and confidently that your PIN machine is secure and complies with the highest industry standards.

PIN payments and other methods can expand your payment options and help you meet customer needs. However, you should choose a PDQ reader only after a careful review of your business model and requirements.

The Evolution of PDQ Machines

Before Chip & PIN was introduced in the UK in 2006, merchants relied on PDQ machines.

The process was slow. Staff had to swipe the card, print a receipt, and verify that the signature on the card matched the one on the receipt.

This method increased the risk of fraud, as criminals could copy signatures without easy detection.

Estimates show that between 2004 and 2014, more than £81.9 million in credit card fraud losses were prevented due to these machines. They require customers to insert their card and enter a PIN that only they know.

Credit card readers are a newer and more secure version of the original Process Data Quick (PDQ) machines.

Are PDQ Machines Still Relevant Today?

Although the term “PDQ machine” is used less frequently, the technology it represents remains central to modern payment ecosystems. Today’s card terminals are more advanced, but they are built on the same core principles of fast, secure transaction processing.

Modern businesses still rely on these devices to accept a wide range of payment methods, from chip and PIN to contactless cards and digital wallets. What has changed is the level of sophistication. Newer terminals offer faster processing speeds, enhanced security features, and additional functionality such as integrations with POS systems, inventory tools, and business analytics.

Relevance today is less about the terminology and more about capability. Whether referred to as a PDQ machine or a card terminal, these devices are essential for meeting customer expectations in a predominantly cashless environment. Businesses that do not offer card payment options risk losing sales, particularly as consumers increasingly prioritise speed, convenience, and flexibility at checkout.

From an operational standpoint, modern payment terminals also support better cash flow management through faster settlement options and improved transaction tracking. This makes them not only relevant but critical infrastructure for businesses aiming to operate efficiently and scale in a competitive market.

Alternatives Offered by myPOS

For businesses considering an alternative to a conventional PDQ machine, myPOS offers several payment acceptance options that differ by hardware, mobility, and receipt capability. 

Here are the options to know about:

• myPOS Glass is the software-first option. It allows merchants to accept contactless card payments and digital wallets directly on a compatible smartphone, without a separate card reader. It also supports sending receipts by email or SMS, while the accepted funds are credited to the merchant’s myPOS account immediately after a successful transaction. This is the most practical choice for businesses that want to minimise hardware and take payments on the move.
  
• myPOS Go 2 is the dedicated handheld terminal in the range. It comes with data connectivity and Wi-Fi, supports cards and mobile wallets, and can send digital receipts by email or SMS. The card reader has a 2.4-inch TFT display and a 1500 mAh battery, making it a straightforward fit for merchants who need a standalone payment device rather than a phone-based setup.
  
• myPOS Go Combo is the operational upgrade for merchants who need paper receipts. It combines the myPOS Go 2 terminal with a charging and printing dock with a 7.4V / 2600 mAh battery and a built-in thermal printer. This makes it better suited to retail counters and service environments where printed receipts are still part of the workflow.

In practical terms, the choice comes down to the operating model. myPOS Glass is the lightest option for mobile acceptance with no extra hardware, myPOS Go 2 is the standard standalone terminal, myPOS Go Combo is the better fit where receipt printing is required.

Frequently Asked Questions

When should I choose a smart terminal over a traditional PDQ?

Choose a smart terminal if you need more than just taking payments. If your business can benefit from more advanced apps like inventory management, reporting, or integrations with other business payment solutions, a smart device is the better long-term option.

How does Tap to Pay on phone compare to a portable PDQ?

Tap to Pay on phone is a flexible, low-cost option with easy setup, turning your smartphone into a payment device, which is great for businesses on the go or just starting out. However, a portable PDQ is often more durable and reliable, and offers a more professional checkout experience.

Is upgrading from a rented PDQ to a smart device complex?

Not at all. Most providers make the transition simple, with easy setup, onboarding guidance, and ongoing tech support. In many cases, you can request a free quote, compare devices, and switch with minimal disruption.