How to make a post on primedice?

[overG]

I want to change seed with api https://primedice.com/api
They say

Change your seed
POST /seed

Expects a seed. Requires authentication.

I make requests.post('https://api.primedice.com/api/seed/new_seed?api_key=code_key')
But say "Cannot POST /api/seed/new_seed?api_key=code_key"

Does anyone have idea how to do a post?