IndexNow is a useful resource when people are checking products, services or resources. The website explains a protocol that allows websites to notify participating search engines about new, updated or deleted URLs.
IndexNow.org is well-known as an official site of the IndexNow protocol which tells website owners how to submit URL updates to participating search engines.
There are no promo codes for IndexNow. It is a protocol which allows website owners or developers to make URL submission to search engines.
IndexNow is offered as free protocol which you can use without additional costs. But sometimes website owners need some developing time to use IndexNow properly.
Using IndexNow website owner can submit updates faster to participating search engines without waiting for their natural crawling and indexing.
Not always. Some CMS-plugins or webmaster tools allow using IndexNow protocol. Developers can use protocol documentation in order to use it.
Practically no, but it will allow search engines to get your URL updates fast and make decision regarding the crawling and indexing.
People who run websites such as news site, ecommerce store, coupon site, marketplace, blog and so on. It is less useful for static website with rare updates but implementing it takes little time.