# Save or Create an account user

Saves or Creates an account specified by account_id and user_id.

Endpoint: PUT /v3/accounts/{account_id}/users/{user_id}
Version: 2026-01-08
Security: ZephrHmacHttp

## Path parameters:

  - `account_id` (string, required)
    Unique Account identifier
    Example: "5fag4a2d-86cd-4bb0-a5df-68dca75a3a21"

  - `user_id` (string, required)
    Unique User identifier
    Example: "3f589a2d-86ad-4b70-a5df-68dca75a3a21"


## Response 200 fields

## Response 201 fields

## Response 400 fields