Square is an increasingly popular credit card processing company that can be used with your mobile phone, Point of Sale at brick and mortar store or at fairs and now is available to be used as the payment module for your Zen Cart store.

Accept credit cards in less than 5 minutes.
No monthly fees and no setup fees.
PCI Compliant. Customer never leaves your store!
Standard rates are 2.9% + $0.30 per transaction.
Funds are deposited in your bank account in 1-2 business days.
Track your online and offline sales in one place.
NOTE: Requires minimum PHP version 5.4. Using PHP 5.6 or higher is preferable.
If you don't already have a Square account, you can get one FOR FREE at squareup.com
or by clicking the image above.

Works with Zen Cart 1.5.5 +, included in 1.5.5F and 1.5.6+