Follow these steps to set the default Gateway for checkout pages:

- From the Dashboard, select the the "Integrations" drop-down menu and select "Merchant Gateway." 

- While on the "Merchant Gateway" page, select the "Set Default Gateway" button at the top right of the page.

- Select which Gateway you would like to be set as the default on the "Gateway" drop-down menu.

- When finished, press the "Save" button.