Log in to the WinSMS Client Zone with your log in credentials here and once logged in, click on 'My Profile'. 

On the next step, click on 'Disable 1-Click Payment'. 

You will now receive the following pop up: Please click on 'OK' to disable 1-Click Payments. 

The final pop up states that you have successfully disabled 1-Click Payments on your WinSMS account. Click on 'OK'. 

Further click on 'OK' to save your changes. 

Click on 'OK'. 

All changes have been saved successfully.