'meta_data' =>
    array (size=1)
      0 =>
        array (size=3)
          'id' => int 3293
          'key' => string 'kambusa' (length=7)
          'value' => string '123' (length=3)

$data = [
    'regular_price' => '21.00',
    'meta_data' => [
        ['kambusa' => '456']
    ]
];

print_r($woocommerce->put('products/530', $data));

$args = array(
    'id'            => $this->textfield_id,
    'label'         => sanitize_text_field( 'Kambusa ID' ),
    'placeholder'   => $placeholder,
    'desc_tip'      => true,
   'description'    => $description,
);
woocommerce_wp_text_input( $args );

$data = [
    'regular_price' => '21.00',
    'meta_data' => [
        ['key' => 'kambusa'],
        ['value' => '456']
    ]
];