WordPress at a glance
filter is not described

woocommerce_downloadable_products_settings filter-hook . WC 1.0

Usage

add_filter( 'woocommerce_downloadable_products_settings', 'filter_function_name_3698' );
function filter_function_name_3698( $array ){
	// filter...

	return $array;
}
$array
-

Where the hook is called

WC_Settings_Products::get_settings()
woocommerce_downloadable_products_settings
woocommerce/includes/admin/settings/class-wc-settings-products.php 210-269
$settings = apply_filters(
	'woocommerce_downloadable_products_settings',
	array(
		array(
			'title' => __( 'Downloadable products', 'woocommerce' ),
			'type'  => 'title',
			'id'    => 'digital_download_options',
		),

		array(
			'title'    => __( 'File download method', 'woocommerce' ),
			'desc'     => sprintf(
				/* translators: 1: X-Accel-Redirect 2: X-Sendfile 3: mod_xsendfile */
				__( 'Forcing downloads will keep URLs hidden, but some servers may serve large files unreliably. If supported, %1$s / %2$s can be used to serve downloads instead (server requires %3$s).', 'woocommerce' ),
				'<code>X-Accel-Redirect</code>',
				'<code>X-Sendfile</code>',
				'<code>mod_xsendfile</code>'
			),
			'id'       => 'woocommerce_file_download_method',
			'type'     => 'select',
			'class'    => 'wc-enhanced-select',
			'css'      => 'min-width:300px;',
			'default'  => 'force',
			'desc_tip' => true,
			'options'  => array(
				'force'     => __( 'Force downloads', 'woocommerce' ),
				'xsendfile' => __( 'X-Accel-Redirect/X-Sendfile', 'woocommerce' ),
				'redirect'  => __( 'Redirect only', 'woocommerce' ),
			),
			'autoload' => false,
		),

		array(
			'title'         => __( 'Access restriction', 'woocommerce' ),
			'desc'          => __( 'Downloads require login', 'woocommerce' ),
			'id'            => 'woocommerce_downloads_require_login',
			'type'          => 'checkbox',
			'default'       => 'no',
			'desc_tip'      => __( 'This setting does not apply to guest purchases.', 'woocommerce' ),
			'checkboxgroup' => 'start',
			'autoload'      => false,
		),

		array(
			'desc'          => __( 'Grant access to downloadable products after payment', 'woocommerce' ),
			'id'            => 'woocommerce_downloads_grant_access_after_payment',
			'type'          => 'checkbox',
			'default'       => 'yes',
			'desc_tip'      => __( 'Enable this option to grant access to downloads when orders are "processing", rather than "completed".', 'woocommerce' ),
			'checkboxgroup' => 'end',
			'autoload'      => false,
		),

		array(
			'type' => 'sectionend',
			'id'   => 'digital_download_options',
		),

	)
);

Where the hook is used (in WC core)

Usage not found!