Form Helper (snippet 3)

add_action( 'wcvendors_settings_after_seller_info', 'checkbox_check' );

function checkbox_check(){

	$key = '_wcv_custom_settings_checkbox3';

	$value = get_user_meta( get_current_user_id(), $key, true );

	WCVendors_Pro_Form_Helper::input( apply_filters( $key, array(

		'id' => $key,

		'label' => __( 'Fairtrade', 'wcvendors-pro' ),

		'type' => 'checkbox',

		'desc_tip' => true,

		'value' => $value,

		'description' => __('Check this box if you are fairtrade.', 'wcvendors-pro'),

		) )

	);

}

function fairtrade( $vendor_id ) {

	if ( ! isset( $_POST[ '_wcv_custom_settings_checkbox3' ] ) ){

		delete_user_meta( $vendor_id, '_wcv_custom_settings_checkbox3' );

	}

 }

add_action ('wcv_pro_store_settings_saved','fairtrade');