Can't create pipeline with stage via API.

I tried to create pipeline with stages via API as described in documentation.

I see that pipeline was created, but stage was not.

Also, i see error in response:
{"errorMessage"=>"name is a required field for each stage object"}

Actually when i trying update pipeline to add stage i also see the same

Data:
{
"name"=>"Test",
"description"=>"A pipeline for test",
"orderWeight"=>3000,
"stages"=> [
{
"name"=>"Listed",
"color"=>"#ffad81",
"description"=>"",
"orderWeight"=>1000
}
]
}

What wrong with this hash? Why it's not working?

P.S. Also API documentation say that Pipeline PUT request should be by this url:
https://api.followupboss.com/v1/pipelines
But works only: https://api.followupboss.com/v1/pipelines/1