To create an online account or link a Card to your existing online account, go to americanexpress.com/register. If you're an Additional Card Member, when you're setting up your online account, you'll need the Basic Card Member's date of birth as well as your own personal information.

Linking a new American Express card to your existing online account is a straightforward process that can be done via the Amex mobile app or the official website. If using the app, log in, navigate to the "Account" tab, and select the option to "Activate and Add a Card." You will need to enter the 15-digit card number and the 4-digit CID (Security Code) found on the front of the card. On the website, you can visit the "Register for Online Services" page; once you enter your card details and verify your identity through security questions or a one-time code sent to your phone, the card will be "linked" to your existing User ID. This allows you to manage all your Amex cards—including tracking Membership Rewards points and paying bills—under a single login. In 2026, Amex also allows you to link cards instantly upon approval, even before the physical plastic arrives, so you can start using it in digital wallets.

To link your American Express (Amex) card to your account, follow these steps based on the platform or service you’re using. Below are general instructions for common scenarios:

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1. Linking Amex Card to Amex Online Account

If you want to link your Amex card to your Amex online account: 1. Log In to your Amex account at americanexpress.com. 2. If you don’t have an account, click “Create Account” and follow the prompts. 3. Once logged in, go to “Account Services” or “Card Management.” 4. Select “Add a Card to Your Account.” 5. Enter your card details (card number, expiration date, security code, etc.). 6. Verify your identity if prompted. 7. Your card will now be linked to your account.

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2. Linking Amex Card to Payment Platforms

If you’re linking your Amex card to a service like PayPal, Google Pay, Apple Pay, or a retailer: 1. Sign In to your account on the platform (e.g., PayPal, Google Pay, Apple Pay). 2. Navigate to “Payment Methods” or “Wallet.” 3. Select “Add a New Card” or similar option. 4. Enter your Amex card details (card number, expiration date, CVV, billing address). 5. Follow any verification steps (e.g., SMS code, email confirmation). 6. Your Amex card will now be linked and ready for use.

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3. Linking Amex Card to Mobile Apps

For apps like Uber, Lyft, or other services: 1. Open the app and go to “Settings” or “Payment Methods.” 2. Tap “Add Payment Method” or “Add Card.” 3. Enter your Amex card details. 4. Save the card, and it will be linked to your account.

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4. Linking Amex Card to Online Retailers

For e-commerce platforms like Amazon or eBay: 1. Log in to your account on the retailer’s website or app. 2. Go to “Payment Methods” or “Wallet.” 3. Select “Add a Credit Card.” 4. Enter your Amex card details and billing information. 5. Save the card, and it will be linked to your account.

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Important Notes:

• Ensure you’re using the correct card details (card number, expiration date, CVV).
• Some platforms may require verification through Amex’s website or app.
• If you encounter issues, contact Amex customer service or the platform’s support team for assistance.

Let me know if you need help with a specific platform!