You can modify your payment method settings from your Customer Area (test or live).

Select your merchant account, then go to Settings > Payment methods. 

Using the checkboxes on the left hand side of the screen, select the payment method you would like to modify. A number of options will appear; 

• Activate - Activate the selected payment methods. Please note that methods that have been disabled by Adyen cannot be activated. Please reach out to our Support team if activating a payment method fails. 
• Deactivate - Deactivate the selected payment methods
• Change weight 
• Change country

You can modify multiple payment methods at once.