Your account needs to be connected with a payment processor like PayPal for customers to be able to buy your offers.
To connect your account with Paypal, you can follow these steps below:
After logging into your account and everything is set, you can click the [Return to Store] button to return to CartMango.
On the CartMango page, you can see that your Paypal account has been connected:
You can also connect your Paypal account on the [More] tab of your offers: