Are Organization Slugs & Ids Deprecated?

I created a new product, and I used some compiled code that should be automatically generating webhooks for that product, via Particle’s REST API. I was surprised by an error: “Product not found for organization.”. It appears my new product is associated with a new organization id, which is surprising, I thought there should only be one.

Searching this forum, I found this post that suggests Organization Slugs & Ids are deprecated. Is that the case? If so, is there a reason products are still being assigned organization ids?

Incidentally, this is the URL my code is currently using to generate webhooks:{ORGANIZATION_SLUG}/products/{PRODUCT_SLUG}/webhooks?access_token={ACCESS_TOKEN}

The latest documentation I found suggests it needs to be changed to this:{productSlug}/integrations?access_token={ACCESS_TOKEN}"