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M400 user manual

Learn how to set up, configure, and use the M400 payment terminal.

Get started

Get your new payment terminal up and running:

  1. Inspect the terminal.
  2. Open the cover on the back of the terminal, connect the dongle, and close the cover.
  3. Turn on the terminal by connecting the power supply. During startup the display turns on and off a few times.
  4. Select Configure network and connect the terminal to your network.
  5. Select Board the terminal, select your store, and select Confirm.*
  6. Test the connection with the Adyen platform.
  7. Test the connection with the cash register.

* If Board the terminal doesn't show, wait until the next synchronization with the Adyen platform (on average three hours) and try again.
When you have completed these steps, you are ready to process payments!

Keypad keys

Key Name

Supplied components

  • payment terminal
  • Region-specific power cord
  • Power supply
  • Dongle (Cube Ethernet)
  • Stylus pen
  • Privacy shield

Admin menu

You'll need the Admin menu on the terminal for various tasks. To open the Admin menu:

  1. Select 9 and then the Confirm key.
  2. Enter the Admin PIN code and select the Confirm key. Where do I find the Admin PIN?
Option Description
Network Configure network settings.
Run diagnostic connection tests.
Software Update the terminal software.
Config Update, view, or remove the configuration.
You can view the configuration version, the installed software release, and hardware details such as the unique terminal ID.
Transaction Get an overview of transactions stored on the terminal.
Reboot Restart the terminal.

Info menu

The Info menu shows:

  • The type of network connection that the terminal is using and the IP address of the terminal.
  • Other details such as the terminal ID and store.
  • A QR code containing information we can use for troubleshooting.

To open the Info menu:

  • Select 5 and then the Confirm key.

Inspect the terminal

Because payment terminals process sensitive card data, it is important to make sure that the terminal you received is the correct Adyen terminal and hasn't been tampered with. If any of the following checks fails, contact our POS Support Team immediately.

  1. Verify that the box containing the terminal hasn't been opened and that the security seal is intact.
    The security seal is a red label with a bar code and a number, stuck across the lid of the box.
  2. If you have access to the Adyen Customer Area, log in and under Point of sale > Orders and returns find the order for your terminal. Then:
    • Verify that the terminal serial number (S/N) on the box is the same as in the Customer Area.
    • Verify that the security seal number on the box is the same as in the Customer Area .
    • Using the track & trace information in the Customer Area, track the order with the carrier to verify that they confirm having delivered the payment terminal.
  3. Break the security seal, take the terminal out of the box, and verify that the serial number (S/N) on the terminal itself is the same as the serial number on the box.
  4. Inspect the terminal for tampering. Check for missing seals or screws, additional wires or labels, holes in the device, and anything inserted in or attached to any part of the terminal such as the card reader or ports.

Turn on/off

If you turn on the payment terminal for the first time or after it was off for a long time, it may make a maintenance call to synchronize the configuration and update the software. This can take 10 to 20 minutes.

Turn on the terminal:

  • Connect the terminal to a power supply.
  • Press and hold the Confirm key until the display turns on.

During startup the display turns on and off a few times.

Turn off the terminal:

  • Press and hold the Cancel key until (after 5 - 20 seconds) the display turns off.
  • Disconnect the terminal from the power supply.

Connect to your network

Connect your terminal to the internet so that it can communicate with the Adyen payments platform and your own back end systems.

Connect to your wired network

  • Connect an Ethernet cable to the Ethernet (LAN) port on the dongle.
    That's the port marked with ETH or this symbol:
Connecting the wrong type of cable to the Ethernet port or connecting the Ethernet cable to the wrong port (for example, the RS232 port) may severely damage the terminal.

(Optional) Configure a static IP address for the terminal

By default, DHCP is enabled on the payment terminal. With this setting, your DHCP server assigns an IP address to the terminal. If you are not able to use a DHCP server, you need to disable DHCP and define a static IP address for the terminal:

  1. After the terminal is connected to the internet, go to the Admin menu.
  2. Select Network > Ethernet.
  3. Clear the Use DHCP check box.
  4. Enter your network details. To type a period (.), press 1 twice. Enter the IP address, the Subnet mask, the Default gateway, the Preferred DNS, and the Alternate DNS.
    The static IP address must be unique in the network and, if you have more than one terminal, unique for each terminal.
  5. Select Apply.

Test the connection with our platform

Payments made with the terminal are processed on the Adyen payments platform. To test the connection with our platform:

  1. Go to the Admin menu.
  2. Select Network > Diagnostics > PSP connection.
  3. Check whether all items have a green check mark -white_check_mark- and the overall result is Success.
    Don't worry if Receiving data has a red cross -x- and the result is No Error; the terminal successfully connected with our platform.

Test the cash register connection

To test the connection with your cash register:

  1. Go to the Admin menu.
  2. Select Network > Diagnostics > Terminal API.
  3. Check whether all items have a green check mark -white_check_mark- and the overall result is Success.
  4. Select the Cancel button to go back to Diagnostics, and select Endpoints.
    The terminal runs tests on four URLs and then shows a final screen.
  5. Check whether all four URLs in the final screen have a green check mark -white_check_mark-.



If there is an issue with your payment terminal, first try to diagnose and solve the issue yourself, using our Troubleshooting documentation. In many cases, this will be the quickest solution.

Ask for assistance

If you can't resolve the issue using the Troubleshooting documentation, send an email to the POS Support Team.
Provide the following information:

  • Merchant account.
  • PSP reference of the transaction, if applicable.
  • Terminal serial number. This number is available in the Info menu in the format [device model]-[serial number] and also printed on the back of the terminal (for example, S/N:123-456-789).