How to register and sign in to My Payments Insider (MPI)

To sign in to My Payments Insider, go to https://www.mypaymentsinsider.com/. If you don’t have a login yet, you can register there yourself once 48 hours have passed since your Merchant ID was assigned.

  • Applies to: My Payments Insider (MPI)
  • Who can register: account owners and authorized signers
  • You’ll need: your Merchant ID, the email address given during account boarding, and the last 4 digits of your business checking bank account
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How do I register for My Payments Insider?

  1. Launch https://www.mypaymentsinsider.com/ and click Register
  2. Enter your first and last name, your email address, Merchant ID and last 4 digits of your business checking bank account.
  3. Confirm your email: you will receive an email to confirm your email address.
  4. After confirming your email you will need to create a password.
  5. Set security questions and answers. You must set these before you can access the system.

What is single sign-on?

Payments Insider has been moving users to single sign-on accounts since 2021. You may see a screen asking you to set up your single sign-on credentials. To sign in that way, see How to log in to MPI with single sign-on.

Payments Insider screen Set up your single sign-on credentials, with a Create my Credentials button, a Sign in link and a Skip this time link

Common questions

Where do I sign in to My Payments Insider?

Go to https://www.mypaymentsinsider.com/. If you use single sign-on, follow How to log in to MPI with single sign-on.

Why can’t I register?

Registration is limited to account owners and authorized signers, using the email address provided during account boarding. Once registered, account owners can add other users and grant admin access. If you’ve waited 48 hours since your Merchant ID was assigned and still can’t register, contact Cartis at 1-888-712-0770.

Updated November 2, 2026

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