diff --git a/lib/modules/create_invoice/invoice_data.ex b/lib/modules/create_invoice/invoice_data.ex
index baa547a..3f86a91 100644
--- a/lib/modules/create_invoice/invoice_data.ex
+++ b/lib/modules/create_invoice/invoice_data.ex
@@ -1,42 +1,29 @@
 defmodule ExSzamlazzHu.Modules.CreateInvoice.InvoiceData do
-  alias ExSzamlazzHu.Modules.CreateInvoice.Customer
-  alias ExSzamlazzHu.Modules.CreateInvoice.Item
+  alias ExSzamlazzHu.Modules.CreateInvoice.Settings
+  alias ExSzamlazzHu.Utils.Validator
 
-  @derive {Inspect, except: [:agent_key]}
-
-  @type t :: %__MODULE__{
-          agent_key: String.t(),
-          completion_date: String.t(),
-          payment_deadline: String.t(),
-          method_of_payment: String.t(),
-          order_id: String.t(),
-          currency: String.t(),
-          language: String.t(),
-          comment: String.t(),
-          is_proforma: String.t(),
-          is_paid: String.t(),
-          customer: Customer.t(),
-          items: list(Item.t())
-        }
+  @type t :: %__MODULE__{}
 
+  @enforce_keys [:settings]
   defstruct [
-    :agent_key,
-    :completion_date,
-    :payment_deadline,
-    :method_of_payment,
-    :order_id,
-    :currency,
-    :language,
-    :comment,
-    :is_proforma,
-    :is_paid,
-    :customer,
+    :settings,
+    :header,
+    :seller,
+    :buyer,
+    :waybill,
     :items
   ]
 
   def parse(params) do
-    struct(%__MODULE__{}, Map.drop(params, [:customer, :items]))
-    |> Map.put(:customer, Customer.parse(params[:customer]))
-    |> Map.put(:items, Enum.map(params[:items], &Item.parse/1))
+    %__MODULE__{
+      settings: params[:settings]
+    }
+  end
+
+  def validate(struct) do
+    %{
+      settings: &Settings.validate/1
+    }
+    |> Validator.validate(struct)
   end
 end
diff --git a/lib/modules/create_invoice/settings.ex b/lib/modules/create_invoice/settings.ex
new file mode 100644
index 0000000..155af4d
--- /dev/null
+++ b/lib/modules/create_invoice/settings.ex
@@ -0,0 +1,55 @@
+defmodule ExSzamlazzHu.Modules.CreateInvoice.Settings do
+  alias ExSzamlazzHu.Utils.Validator
+
+  @type t :: %__MODULE__{}
+
+  @enforce_keys [:e_invoice, :download_invoice]
+  defstruct [
+    :user,
+    :password,
+    :agent_key,
+    :e_invoice,
+    :download_invoice,
+    :download_invoice_number_of_copies,
+    :response_version,
+    :aggregator,
+    :guardian,
+    :article_identifier_invoice,
+    :external_invoice_identifier
+  ]
+
+  @spec parse(map()) :: t()
+  def parse(params) do
+    %__MODULE__{
+      user: params[:user],
+      password: params[:password],
+      agent_key: params[:agent_key],
+      e_invoice: params[:e_invoice],
+      download_invoice: params[:download_invoice],
+      download_invoice_number_of_copies: params[:download_invoice_number_of_copies],
+      response_version: params[:response_version],
+      aggregator: params[:aggregator],
+      guardian: params[:guardian],
+      article_identifier_invoice: params[:article_identifier_invoice],
+      external_invoice_identifier: params[:external_invoice_identifier]
+    }
+  end
+
+  @spec validate(t()) :: boolean()
+  def validate(struct) do
+    %{
+      user: &(is_nil(&1) or is_binary(&1)),
+      password: &(is_nil(&1) or is_binary(&1)),
+      agent_key: &(is_nil(&1) or is_binary(&1)),
+      e_invoice: &is_boolean/1,
+      download_invoice: &is_boolean/1,
+      download_invoice_number_of_copies: &(is_nil(&1) or is_integer(&1)),
+      response_version: &(is_nil(&1) or is_integer(&1)),
+      aggregator: &(is_nil(&1) or is_binary(&1)),
+      guardian: &(is_nil(&1) or is_boolean(&1)),
+      article_identifier_invoice: &(is_nil(&1) or is_boolean(&1)),
+      external_invoice_identifier: &(is_nil(&1) or is_binary(&1))
+    }
+    |> Validator.validate(struct)
+  end
+end
diff --git a/lib/utils/validator.ex b/lib/utils/validator.ex
new file mode 100644
index 0000000..93d4ce7
--- /dev/null
+++ b/lib/utils/validator.ex
@@ -0,0 +1,19 @@
+defmodule ExSzamlazzHu.Utils.Validator do
+  def validate(rules, struct) do
+    Enum.reduce(rules, {true, %{}}, fn {key, validator}, {is_valid, errors} ->
+      case validator.(Map.get(struct, key)) do
+        true -> {is_valid, errors}
+        false -> {false, Map.put(errors, key, :invalid)}
+        :ok -> {is_valid, errors}
+        {:error, incoming_errors} -> {false, Map.put(errors, key, incoming_errors)}
+      end
+    end)
+    |> then(fn {is_valid, errors} ->
+      if is_valid do
+        :ok
+      else
+        {:error, errors}
+      end
+    end)
+  end
+end