3DS opt out is available to qualifying Worldpay Corporate customers only.
To opt out of 3DS you will need to fill out a 3DS opt out form: http://www.worldpay.com/global/support/cardholder-authentication-opt-out.
Note: 3D Secure will be a requirement for all payments made within the EEA in order to meet PSD2 regulations when they come in to force.