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"I am a very satisfied customer. Arsenal is always accommodating to my needs."

Gale M.
  • Fast

    Lock and unlock anywhere

  • Free

    Download on Apple or Android

You're in control

Arsenal Credit Union is in the business of saving you time, stress and money. Our CardKey mobile app does all three. Decide exactly how and when your Arsenal debit and credit cards work.

Why use CardKey?

We’re putting control in the palm of your hand – literally! CardKey is free to download and helps keep your Arsenal debit and credit cards safe and secure. Once you download the CardKey app, you can easily access it on its own or through the Arsenal Mobile Banking app.

  1. 1

    Lock and Unlock

    Have a lost or stolen Arsenal debit or credit card? Lock and unlock it with one touch in the CardKey app.

  2. 2

    Customize Alerts and Controls

    Set controls around things like purchase amounts, merchant types and locations. You can also receive notifications when transactions outside of those controls are attempted.

  3. 3

    Set Travel Notifications

    Going out of town? Let us know so you keep complete access over your cards.

Our CardKey app is a snap!

You’re just a few steps away from making CardKey your own.


  • Manage your debit or credit card
  • Set up alerts and controls
  • Turn cards on/off
  • Notify us when you’re travelling
  • Report cards as stolen
  • Filter card transactions
  • Pay your credit card bill
  • Check your CU Rewards balance
The latest version of iOS and Android are supported, plus two previous versions.
You’ll need to be connected to the internet to use the app. We recommend always using a secure Wi-Fi connection or your mobile data plan. Using a public Wi-Fi connection puts your information at risk of theft.
You need to have the card number for the card you want to manage and your contact information.
When you login for the first time, use the “Enroll” feature to add your initial card. For additional cards, launch the app and scroll to the right until you see the “Add a Card” link.
Yes! You can place all of your Arsenal Credit Union debit and credit cards into the application. Any Arsenal Credit Union card with a Visa logo can be added to the app.
Please call the number provided. If you tried to log in to your account but failed to enter the correct username and password five or more times, then your account will be locked and will need to be unlocked before you can log into the app.
If you forget your username, tap on “Forgot Username” and enter the email address associated with your profile. You will then be prompted to answer a security question. After you verify your identify, we will send your username to the email address you provided.
If you forget your password, tap on “Forgot Password” and enter your username and one of the card numbers that has been associated with your account. You will then be prompted to answer a security question. After you verify your identity, we will send a temporary password to the email address associated with your profile. The temporary password will expire after 1 hour. Return to the login page, login with your username and temporary password, and then you will be prompted to enter your temporary password once again and to pick and verify a new password.
On the Account Summary screen, tap on the hamburger menu in the upper left corner, and then tap on the Edit Profile icon to the right of your username. From this screen, you can manage your profile picture, edit your profile information, update your password and change your security questions.
Arsenal CardKey displays all debit card transactions within the past 30 days and all credit card transactions within the past 90 days.
An alert is a text notification sent to your cell phone when a transaction takes place with a specific card. A control/restriction limits the use of the card based on the preferences or filters you defined.
No, if you previously set up alerts for your card on our website, you will need to set up new alerts in the app.
Within moments after you hit “submit,” the locks, controls and alerts are activated.
Alerts, when enabled, will be sent as SMS text messages to the phone number that is in on your profile. If you enable alerts, please make sure a valid phone number that can receive text messages has been added to your profile. You may receive your alerts at the email address that is on your profile if the service that delivers text messages is temporarily unavailable.
You are getting this message because you reported that the address we have on file is not correct. We do not want to process the report and then send your replacement card to the wrong address, so we need to update your address first. Please call us at 314.962.6363, Option 6, for assistance.
If you need assistance and you are on the login page, tap on “Contact” at the bottom right to pull up a number you can call. If you are already logged into your account, tap on the hamburger menu in the upper left, and then tap on “Contact” at the bottom of the menu that appears.

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But that's not it.

Discover all of the ways you can control your Arsenal debit and credit cards with CardKey

  • See, by card, every purchase you make

    CardKey lets you see every single transaction you make in real-time, giving you a glimpse into how often you use your card.

  • Pay your credit card bill

    View your transactions and make your monthly payments within the app.

  • View your CU Rewards points

    See how many points you earn on credit and signature-based debit transactions (click the “view points” link in the center of your card on the Account Summary page).

  • Customize your CardKey

    Upload your photo and use your fingerprint to log in.

Our CardKey app is a snap!