curl --request DELETE \
  --url https://{cluster}.voucherify.io/management/v1/projects/{projectId}/users/{userId}

{
  "code": 400,
  "key": "user_not_assigned",
  "message": "User is not assigned",
  "details": "User is not assigned to the project",
  "request_id": "v-0e9a1b979a80a99053"
}

{
  "code": 401,
  "message": "Unauthorized",
  "key": "unauthorized"
}

{
  "code": 402,
  "message": "Payment required",
  "details": "Your current plan does not include a feature required to perform this operation.",
  "key": "missing_required_feature"
}

{
  "code": 404,
  "key": "not_found",
  "message": "Resource not found",
  "details": "Cannot find user with id user_VNBwrq3d4OaxJjoykkwIRTbqgnYgjCl",
  "request_id": "v-0e9a1b4b98c0a98ffc",
  "resource_id": "user_VNBwrq3d4OaxJjoykkwIRTbqgnYgjCl",
  "resource_type": "user"
}