Create server subscription for cups using IPP

Question

I'm trying to create a server/system subscription for cups using IPP. According to their docs, it should be possible; however, I can't seem to get it to work, and I'm not finding anything online.

I could generate printer-subscription that look like this:

{
VERSION 2.0
OPERATION Create-Printer-Subscriptions
GROUP operation-attributes-tag
ATTR "attributes-charset" charset: utf-8
ATTR "attributes-natural-language" naturalLanguage: en-US
ATTR "printer-uri" uri: ipp://0.0.0.0:631/printers/PDF
GROUP subscription-attributes-tag
ATTR "notify-events" keyword: printer-modified,printer-added,printer-deleted
ATTR "notify-recipient-uri" uri: http://127.0.0.1:3333
}

However, when trying to use the create-system-subscription operation, it replaces printer-uri with system-uri and tells me I'm missing attributes.

{
 VERSION 2.0
 OPERATION Create-System-Subscriptions
 GROUP operation-attributes-tag
 ATTR "attributes-charset" charset: utf-8
 ATTR "attributes-natural-language" naturalLanguage: en-US
 ATTR "system-uri" uri: ipp://0.0.0.0:631/
 GROUP subscription-attributes-tag
 ATTR "notify-events" keyword: printer-added,printer-deleted,printer-modified
 ATTR "notify-recipient-uri" uri: rss://host.docker.internal:3333/
}

Answer 1

it seems cups handles this a bit different, for anyone wondering it is possible to achieve this by using the create-printer-subscription request and using "/" as the printer-uri