Short answer
You get a higher commission rate when a product has a Soco higher-commission link available, and when you add that link to your showcase.
How it works
Soco scans for products where brands offer a higher commission.
If a higher-paying link exists, Soco provides it to you.
The higher rate applies only to new lives/videos posted after the Soco link is added to your showcase.
Key point
You only receive the higher commission on content posted after the higher-commission link is added.