WordPress at a glance
filter is not described

woocommerce_paypal_line_item filter-hook . WC 1.0

Usage

add_filter( 'woocommerce_paypal_line_item', 'filter_function_name_3961', 10, 5 );
function filter_function_name_3961( $array, $item_name, $quantity, $amount, $item_number ){
	// filter...

	return $array;
}
$array
-
$item_name
-
$quantity
-
$amount
-
$item_number
-

Where the hook is called

WC_Gateway_Paypal_Request::add_line_item()
woocommerce_paypal_line_item
woocommerce/includes/gateways/paypal/includes/class-wc-gateway-paypal-request.php 492-504
$item = apply_filters(
	'woocommerce_paypal_line_item',
	array(
		'item_name'   => html_entity_decode( wc_trim_string( $item_name ? wp_strip_all_tags( $item_name ) : __( 'Item', 'woocommerce' ), 127 ), ENT_NOQUOTES, 'UTF-8' ),
		'quantity'    => (int) $quantity,
		'amount'      => wc_float_to_string( (float) $amount ),
		'item_number' => $item_number,
	),
	$item_name,
	$quantity,
	$amount,
	$item_number
);

Where in WP core the hook is used WooCommerce

Usage not found.