Particle API (List Products API Call)

Update,

The post I am referring to stating that the organizations slugs are no longer in use is found here:

I am currently working around this issue by listing all devices associated to my account by using:
GET /v1/devices

then running through each device and creating a set of products, thus giving me a unique list of products for all my devices (which is going to be 500+ by the end of the month). I find that this is very inefficient and wondering if there is a more preferred way of obtaining products under an organization that is not depreciated.

Side Question on Particle API:
Is there any way to set a product data limit (setting all SIMs in a given product to the same data limit without going through each individual device, similar to set data limit on the sim card page under a given product, see below)