Support Needed - autoCreate API

I tried to hit this API:

“action”: “autoCreate”,
“user_info”: {
“email”: “jag*****",
“type”: 1,
“first_name”: “Terry”,
“last_name”: “Jones”,
“password”: "

but i am getting this response"
“code”: 200,
“message”: “No privilege.”

So few questions,
1.Is a developer account needed to do this to create user API ?
2. Is my account not a developer account ?
3. How to get a developer account ?
4. Shd we need to buy a pro account, to use these API’s ?

Hi @jagajeevan to use autoCreate, your account will need to have a Managed Domain: