Add a Buyer User
Add a new buyer user and send an invitation email
        POST
    /buyers/{buyerId}/buyer_users
  
  curl \
 --request POST 'https://stg.getfoundation.com/api/external/v1/buyers/{buyerId}/buyer_users' \
 --header "X-API-Key: $API_KEY" \
 --header "Content-Type: application/json" \
 --data '{"buyer_user":{"full_name":"John Doe","role":"owner"}}'
    
        Request examples
  
  {
  "buyer_user": {
    "full_name": "John Doe",
    "role": "owner"
  }
}
        Response examples (201)
  
  {
  "id": "9aa62446-c3b0-42f5-8027-3648daed9d73",
  "full_name": "John Doe",
  "email": "hello@example.com",
  "role": "owner",
  "status": "active",
  "created_at": "2025-05-04T09:42:00Z",
  "updated_at": "2025-05-04T09:42:00Z"
}