How to get quantity of a woocommerce subscription?

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// Get the subscription ID
$subscription_id = 123;

// Get the subscription object
$subscription = wcs_get_subscription( $subscription_id );

// Check if the subscription is valid
if ( $subscription ) {
    // Get the quantity of the subscription
    $subscription_quantity = $subscription->get_quantity();

    // Output the quantity
    echo 'Quantity: ' . $subscription_quantity;
} else {
    echo 'Invalid subscription ID';
}