Shopact registration is mandatory for Udyam registration to identify the business. Also, it is limited to Indian users only as per the KYC docs required so I assume this topic should be moved to Indian board.

Udyam registration is really useful for startups as Indian government also has some perks for startup recognition where we can also avail some tax benefits.

Overall, I find this information quite useful and those who are not aware can gain immense knowledge about starting up a business in India. But again, it is limited to Indian users only.