The first in setting up your payment gateway is enabling payments in the admin dashboard. Here’s how you can do that:

• Go to the Extensions button on the top right corner of the dashboard and click on More
• A list of all the extensions you can choose from will be visible. Pick a particular payment gateway
• Enable and Edit the settings to enter the required keys
• Make sure that the current currency of the store is supported by the payment gateway that you are going to select