Donation Fee Radio Field

/**

 * 1. Register the Required Yes/No Radio Field

 */

add_action( 'init', function() {

    if ( ! class_exists( 'Charitable_Donation_Field' ) ) return;

    $field = new Charitable_Donation_Field( 'cover_fee_choice', array(

        'label' => __( 'Would you like your donation to cover third-party credit card processing fees?' ),

        'data_type' => 'meta',

        'donation_form' => array(

            'type'     => 'radio',

            'required' => true, 

            'options'  => array(

                'yes' => __( 'Yes, add the processing fee so the charity gets 100%' ),

                'no'  => __( 'No, I prefer not to' ),

            ),

            'show_after' => 'amount', 

        ),

        'admin_form'   => true,

        'show_in_meta' => true,

    ) );

    charitable()->donation_fields()->register_field( $field );

});