Take a Credit Card Payment

Applies to: Reader SDK - Android | Reader SDK - iOS

Learn how to connect a Square Reader and complete a credit card transaction.


The Mobile Payments SDK has launched as the successor of the Reader SDK. To take in-person payments on Square hardware, you should migrate from the Reader SDK to the Mobile Payments SDK.

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If you've been working with a virtual device, you need to deploy the sample application to a physical device and authorize the Reader SDK with a new mobile authorization code before continuing.

Did you know?

If you don't have a Square Reader, you can purchase a Magstripe Reader online or buy a Square Reader online or in person.

  1. If you've never taken card payments before, activate your account for credit card payments. You see a green Activate button if you still need to activate your account. If you don't see the button, you're already activated.
  2. Connect a Square Reader:
    • If you have a Contactless and Chip Reader, choose Settings in the sample application, choose Reader Settings, and then follow the prompts. If you run into trouble connecting the Reader, see Set Up the Square Reader for Contactless and Chip for assistance.
    • If you have a Magstripe Reader, plug it into your mobile device and grant the Reader microphone permissions if prompted.
  3. Choose the Charge $1.00 button to complete a credit card transaction.
  4. View the transaction details in the Seller Dashboard. You should refund the transaction while you're in the Seller Dashboard.

A graphic showing the Reader SDK Utility screen with $1.00 charge, with options for updating reader settings or deauthorizing the reader, and a third page with a list of connected card readers.


You just completed a credit card transaction with a Square Reader and the Reader SDK.

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