In this article:
https://support.cloudflare.com/hc/en-us/articles/360000841472
I think there are some missing quote marks in the example script.
–data ‘{account: {“id: “id_of_that_account”}, name”:"’$domain’“,“jump_start”:true}';
should be (I think):
–data '{“account” : {“id” : “id_of_that_account”}, “name”:”‘$domain’",“jump_start”:true}';