Price Valid Until google field price field "priceValidUntil"

Price Valid Until google field price field "priceValidUntil"
If I do a source page view it exists but with a "null" entry.

Any idea where this can be set ? Google needs it or errors.

This needs to be used even with "qty price discounts" as well as Campaigns.
Regards

Do they have a settings value or instruction for those with "continous, until further notice"?

Demonstrative examples of how to nail qty price breaks and discount much appreciated.

here is google snapshot

here is google more info page url
https://developers.google.com/search/docs/appearance/structured-data/product

Ill see if i can find anything else

You will need to add this commit.
https://github.com/litecart/litecart/commit/0308ab01ae0dafc83a1a2ad9ac7cc36eeca176de

Then in pages/feeds/google_shopping.csv.inc.php:

Find

'sale_price' => (!empty($product['campaign_price']) ? currency::format_raw(tax::get_price($product['campaign_price'], $product['tax_class_id']), currency::$selected['code']) .' '. currency::$selected['code'] : ''),

After that, add

'priceValidUntil' => (!empty($product['campaign_price']) ? date('c', strtotime($product['campaign_end_date'])) : ''),

well done !