diff --git a/lib/iban_ex/country/at.ex b/lib/iban_ex/country/at.ex
index 00ae2fe..a69b8ba 100644
--- a/lib/iban_ex/country/at.ex
+++ b/lib/iban_ex/country/at.ex
@@ -3,32 +3,8 @@ defmodule IbanEx.Country.AT do
   Austria IBAN parsing rules
   """
 
-  alias IbanEx.Iban
-
-  @behaviour IbanEx.Country.Template
-
   @size 20
-
   @rule ~r/^(?<bank_code>[0-9]{5})(?<account_number>[0-9]{11})$/i
 
-  @spec size() :: 20
-  def size(), do: @size
-
-  @spec rule() :: Regex.t()
-  def rule(), do: @rule
-
-  @spec to_s(Iban.t()) :: binary()
-  @spec to_s(Iban.t(), binary()) :: binary()
-  def to_s(
-        %Iban{
-          country_code: country_code,
-          check_digits: check_digits,
-          bank_code: bank_code,
-          account_number: account_number
-        } = _iban,
-        joiner \\ " "
-      ) do
-    [country_code, check_digits, bank_code, account_number]
-    |> Enum.join(joiner)
-  end
+  use IbanEx.Country.Template
 end
diff --git a/lib/iban_ex/country/be.ex b/lib/iban_ex/country/be.ex
index 9b6046b..56df70e 100644
--- a/lib/iban_ex/country/be.ex
+++ b/lib/iban_ex/country/be.ex
@@ -3,23 +3,15 @@ defmodule IbanEx.Country.BE do
   Belgium IBAN parsing rules
   """
 
-  alias IbanEx.Iban
-
-  @behaviour IbanEx.Country.Template
-
   @size 16
-
   @rule ~r/^(?<bank_code>[0-9]{3})(?<account_number>[0-9]{7})(?<national_check>[0-9]{2})$/i
 
-  @spec size() :: 16
-  def size(), do: @size
+  use IbanEx.Country.Template
 
-  @spec rule() :: Regex.t()
-  def rule(), do: @rule
-
-  @spec to_s(Iban.t()) :: binary()
-  @spec to_s(Iban.t(), binary()) :: binary()
-  def to_s(
+  @impl IbanEx.Country.Template
+  @spec to_string(Iban.t()) :: binary()
+  @spec to_string(Iban.t(), binary()) :: binary()
+  def to_string(
         %Iban{
           country_code: country_code,
           check_digits: check_digits,
diff --git a/lib/iban_ex/country/bg.ex b/lib/iban_ex/country/bg.ex
index 8c6e290..64e5a38 100644
--- a/lib/iban_ex/country/bg.ex
+++ b/lib/iban_ex/country/bg.ex
@@ -3,23 +3,17 @@ defmodule IbanEx.Country.BG do
   Bulgaria IBAN parsing rules
   """
 
-  alias IbanEx.Iban
-
-  @behaviour IbanEx.Country.Template
-
   @size 22
-
   @rule ~r/^(?<bank_code>[A-Z]{4})(?<branch_code>[0-9]{4})(?<account_number>[0-9]{2}[0-9A-Z]{8})$/i
 
+  use IbanEx.Country.Template
+
   @spec size() :: 22
-  def size(), do: @size
 
-  @spec rule() :: Regex.t()
-  def rule(), do: @rule
-
-  @spec to_s(Iban.t()) :: binary()
-  @spec to_s(Iban.t(), binary()) :: binary()
-  def to_s(
+  @impl IbanEx.Country.Template
+  @spec to_string(Iban.t()) :: binary()
+  @spec to_string(Iban.t(), binary()) :: binary()
+  def to_string(
         %Iban{
           country_code: country_code,
           check_digits: check_digits,
diff --git a/lib/iban_ex/country/ch.ex b/lib/iban_ex/country/ch.ex
index 0aa9d96..f2f10e7 100644
--- a/lib/iban_ex/country/ch.ex
+++ b/lib/iban_ex/country/ch.ex
@@ -3,32 +3,8 @@ defmodule IbanEx.Country.CH do
   Switzerland IBAN parsing rules
   """
 
-  alias IbanEx.Iban
-
-  @behaviour IbanEx.Country.Template
-
   @size 21
-
   @rule ~r/^(?<bank_code>[0-9]{5})(?<account_number>[0-9A-Z]{12})$/i
 
-  @spec size() :: 21
-  def size(), do: @size
-
-  @spec rule() :: Regex.t()
-  def rule(), do: @rule
-
-  @spec to_s(Iban.t()) :: binary()
-  @spec to_s(Iban.t(), binary()) :: binary()
-  def to_s(
-        %Iban{
-          country_code: country_code,
-          check_digits: check_digits,
-          bank_code: bank_code,
-          account_number: account_number
-        } = _iban,
-        joiner \\ " "
-      ) do
-    [country_code, check_digits, bank_code, account_number]
-    |> Enum.join(joiner)
-  end
+  use IbanEx.Country.Template
 end
diff --git a/lib/iban_ex/country/cy.ex b/lib/iban_ex/country/cy.ex
index 015eb56..113a8fa 100644
--- a/lib/iban_ex/country/cy.ex
+++ b/lib/iban_ex/country/cy.ex
@@ -3,23 +3,15 @@ defmodule IbanEx.Country.CY do
   Cyprus IBAN parsing rules
   """
 
-  alias IbanEx.Iban
-
-  @behaviour IbanEx.Country.Template
-
   @size 28
-
   @rule ~r/^(?<bank_code>[0-9]{3})(?<branch_code>[0-9]{5})(?<account_number>[0-9A-Z]{16})$/i
 
-  @spec size() :: 28
-  def size(), do: @size
+  use IbanEx.Country.Template
 
-  @spec rule() :: Regex.t()
-  def rule(), do: @rule
-
-  @spec to_s(Iban.t()) :: binary()
-  @spec to_s(Iban.t(), binary()) :: binary()
-  def to_s(
+  @impl IbanEx.Country.Template
+  @spec to_string(Iban.t()) :: binary()
+  @spec to_string(Iban.t(), binary()) :: binary()
+  def to_string(
         %Iban{
           country_code: country_code,
           check_digits: check_digits,
diff --git a/lib/iban_ex/country/cz.ex b/lib/iban_ex/country/cz.ex
index 97953b2..2f0c873 100644
--- a/lib/iban_ex/country/cz.ex
+++ b/lib/iban_ex/country/cz.ex
@@ -3,34 +3,8 @@ defmodule IbanEx.Country.CZ do
   Czech Republic IBAN parsing rules
   """
 
-  alias IbanEx.Iban
-
-  @behaviour IbanEx.Country.Template
-
   @size 24
-
   @rule ~r/^(?<bank_code>[0-9]{4})(?<account_number>[0-9]{16})$/i
 
-  @spec size() :: 24
-  def size(), do: @size
-
-  @spec rule() :: Regex.t()
-  def rule(), do: @rule
-
-  @spec to_s(Iban.t()) :: binary()
-  @spec to_s(Iban.t(), binary()) :: binary()
-  def to_s(
-        %Iban{
-          country_code: country_code,
-          check_digits: check_digits,
-          bank_code: bank_code,
-          branch_code: _branch_code,
-          national_check: _national_check,
-          account_number: account_number
-        } = _iban,
-        joiner \\ " "
-      ) do
-    [country_code, check_digits, bank_code, account_number]
-    |> Enum.join(joiner)
-  end
+  use IbanEx.Country.Template
 end
diff --git a/lib/iban_ex/country/de.ex b/lib/iban_ex/country/de.ex
index 3df5418..4ba5d00 100644
--- a/lib/iban_ex/country/de.ex
+++ b/lib/iban_ex/country/de.ex
@@ -3,34 +3,8 @@ defmodule IbanEx.Country.DE do
   Germany IBAN parsing rules
   """
 
-  alias IbanEx.Iban
-
-  @behaviour IbanEx.Country.Template
-
   @size 22
-
   @rule ~r/^(?<bank_code>[0-9]{8})(?<account_number>[0-9]{10})$/i
 
-  @spec size() :: 22
-  def size(), do: @size
-
-  @spec rule() :: Regex.t()
-  def rule(), do: @rule
-
-  @spec to_s(Iban.t()) :: binary()
-  @spec to_s(Iban.t(), binary()) :: binary()
-  def to_s(
-        %Iban{
-          country_code: country_code,
-          check_digits: check_digits,
-          bank_code: bank_code,
-          branch_code: _branch_code,
-          national_check: _national_check,
-          account_number: account_number
-        } = _iban,
-        joiner \\ " "
-      ) do
-    [country_code, check_digits, bank_code, account_number]
-    |> Enum.join(joiner)
-  end
+  use IbanEx.Country.Template
 end
diff --git a/lib/iban_ex/country/dk.ex b/lib/iban_ex/country/dk.ex
index 46ea37a..ad00436 100644
--- a/lib/iban_ex/country/dk.ex
+++ b/lib/iban_ex/country/dk.ex
@@ -2,35 +2,8 @@ defmodule IbanEx.Country.DK do
   @moduledoc """
   Denmark IBAN parsing rules
   """
-
-  alias IbanEx.Iban
-
-  @behaviour IbanEx.Country.Template
-
   @size 18
-
   @rule ~r/^(?<bank_code>[0-9]{4})(?<account_number>[0-9]{10})$/i
 
-  @spec size() :: 18
-  def size(), do: @size
-
-  @spec rule() :: Regex.t()
-  def rule(), do: @rule
-
-  @spec to_s(Iban.t()) :: binary()
-  @spec to_s(Iban.t(), binary()) :: binary()
-  def to_s(
-        %Iban{
-          country_code: country_code,
-          check_digits: check_digits,
-          bank_code: bank_code,
-          branch_code: _branch_code,
-          national_check: _national_check,
-          account_number: account_number
-        } = _iban,
-        joiner \\ " "
-      ) do
-    [country_code, check_digits, bank_code, account_number]
-    |> Enum.join(joiner)
-  end
+  use IbanEx.Country.Template
 end
diff --git a/lib/iban_ex/country/ee.ex b/lib/iban_ex/country/ee.ex
index 48e846a..8cde443 100644
--- a/lib/iban_ex/country/ee.ex
+++ b/lib/iban_ex/country/ee.ex
@@ -3,23 +3,15 @@ defmodule IbanEx.Country.EE do
   Estonian IBAN parsing rules
   """
 
-  alias IbanEx.Iban
-
-  @behaviour IbanEx.Country.Template
-
   @size 20
-
   @rule ~r/^(?<bank_code>[0-9]{2})(?<branch_code>[0-9]{2})(?<account_number>[0-9]{11})(?<national_check>[0-9]{1})$/i
 
-  @spec size() :: 20
-  def size(), do: @size
+  use IbanEx.Country.Template
 
-  @spec rule() :: Regex.t()
-  def rule(), do: @rule
-
-  @spec to_s(Iban.t()) :: binary()
-  @spec to_s(Iban.t(), binary()) :: binary()
-  def to_s(
+  @impl IbanEx.Country.Template
+  @spec to_string(Iban.t()) :: binary()
+  @spec to_string(Iban.t(), binary()) :: binary()
+  def to_string(
         %Iban{
           country_code: country_code,
           check_digits: check_digits,
diff --git a/lib/iban_ex/country/es.ex b/lib/iban_ex/country/es.ex
index adc3318..4f9a457 100644
--- a/lib/iban_ex/country/es.ex
+++ b/lib/iban_ex/country/es.ex
@@ -3,23 +3,15 @@ defmodule IbanEx.Country.ES do
   Spain IBAN parsing rules
   """
 
-  alias IbanEx.Iban
-
-  @behaviour IbanEx.Country.Template
-
   @size 24
-
   @rule ~r/^(?<bank_code>[0-9]{4})(?<branch_code>[0-9]{4})(?<national_check>[0-9]{2})(?<account_number>[0-9]{10})$/i
 
-  @spec size() :: 24
-  def size(), do: @size
+  use IbanEx.Country.Template
 
-  @spec rule() :: Regex.t()
-  def rule(), do: @rule
-
-  @spec to_s(Iban.t()) :: binary()
-  @spec to_s(Iban.t(), binary()) :: binary()
-  def to_s(
+  @impl IbanEx.Country.Template
+  @spec to_string(Iban.t()) :: binary()
+  @spec to_string(Iban.t(), binary()) :: binary()
+  def to_string(
         %Iban{
           country_code: country_code,
           check_digits: check_digits,
diff --git a/lib/iban_ex/country/fi.ex b/lib/iban_ex/country/fi.ex
index 601855b..cafa9b8 100644
--- a/lib/iban_ex/country/fi.ex
+++ b/lib/iban_ex/country/fi.ex
@@ -3,23 +3,15 @@ defmodule IbanEx.Country.FI do
   Finland IBAN parsing rules
   """
 
-  alias IbanEx.Iban
-
-  @behaviour IbanEx.Country.Template
-
   @size 18
-
   @rule ~r/^(?<bank_code>[0-9]{6})(?<account_number>[0-9]{7})(?<national_check>[0-9]{1})$/i
 
-  @spec size() :: 18
-  def size(), do: @size
+  use IbanEx.Country.Template
 
-  @spec rule() :: Regex.t()
-  def rule(), do: @rule
-
-  @spec to_s(Iban.t()) :: binary()
-  @spec to_s(Iban.t(), binary()) :: binary()
-  def to_s(
+  @impl IbanEx.Country.Template
+  @spec to_string(Iban.t()) :: binary()
+  @spec to_string(Iban.t(), binary()) :: binary()
+  def to_string(
         %Iban{
           country_code: country_code,
           check_digits: check_digits,
diff --git a/lib/iban_ex/country/fr.ex b/lib/iban_ex/country/fr.ex
index 8908d6f..cc8d11a 100644
--- a/lib/iban_ex/country/fr.ex
+++ b/lib/iban_ex/country/fr.ex
@@ -3,23 +3,15 @@ defmodule IbanEx.Country.FR do
   France IBAN parsing rules
   """
 
-  alias IbanEx.Iban
-
-  @behaviour IbanEx.Country.Template
-
   @size 27
-
   @rule ~r/^(?<bank_code>[0-9]{5})(?<branch_code>[0-9]{5})(?<account_number>[0-9A-Z]{11})(?<national_check>[0-9]{2})$/i
 
-  @spec size() :: 27
-  def size(), do: @size
+  use IbanEx.Country.Template
 
-  @spec rule() :: Regex.t()
-  def rule(), do: @rule
-
-  @spec to_s(Iban.t()) :: binary()
-  @spec to_s(Iban.t(), binary()) :: binary()
-  def to_s(
+  @impl IbanEx.Country.Template
+  @spec to_string(Iban.t()) :: binary()
+  @spec to_string(Iban.t(), binary()) :: binary()
+  def to_string(
         %Iban{
           country_code: country_code,
           check_digits: check_digits,
diff --git a/lib/iban_ex/country/gb.ex b/lib/iban_ex/country/gb.ex
index e7099e9..61cb7dd 100644
--- a/lib/iban_ex/country/gb.ex
+++ b/lib/iban_ex/country/gb.ex
@@ -3,23 +3,15 @@ defmodule IbanEx.Country.GB do
   United Kingdom IBAN parsing rules
   """
 
-  alias IbanEx.Iban
-
-  @behaviour IbanEx.Country.Template
-
   @size 22
-
   @rule ~r/^(?<bank_code>[A-Z]{4})(?<branch_code>[0-9]{6})(?<account_number>[0-9]{8})$/i
 
-  @spec size() :: 22
-  def size(), do: @size
+  use IbanEx.Country.Template
 
-  @spec rule() :: Regex.t()
-  def rule(), do: @rule
-
-  @spec to_s(Iban.t()) :: binary()
-  @spec to_s(Iban.t(), binary()) :: binary()
-  def to_s(
+  @impl IbanEx.Country.Template
+  @spec to_string(Iban.t()) :: binary()
+  @spec to_string(Iban.t(), binary()) :: binary()
+  def to_string(
         %Iban{
           country_code: country_code,
           check_digits: check_digits,
diff --git a/lib/iban_ex/country/hr.ex b/lib/iban_ex/country/hr.ex
index 416a1fa..bc321e1 100644
--- a/lib/iban_ex/country/hr.ex
+++ b/lib/iban_ex/country/hr.ex
@@ -3,34 +3,8 @@ defmodule IbanEx.Country.HR do
   Croatia IBAN parsing rules
   """
 
-  alias IbanEx.Iban
-
-  @behaviour IbanEx.Country.Template
-
   @size 21
-
   @rule ~r/^(?<bank_code>[0-9]{7})(?<account_number>[0-9]{10})$/i
 
-  @spec size() :: 21
-  def size(), do: @size
-
-  @spec rule() :: Regex.t()
-  def rule(), do: @rule
-
-  @spec to_s(Iban.t()) :: binary()
-  @spec to_s(Iban.t(), binary()) :: binary()
-  def to_s(
-        %Iban{
-          country_code: country_code,
-          check_digits: check_digits,
-          bank_code: bank_code,
-          branch_code: _branch_code,
-          national_check: _national_check,
-          account_number: account_number
-        } = _iban,
-        joiner \\ " "
-      ) do
-    [country_code, check_digits, bank_code, account_number]
-    |> Enum.join(joiner)
-  end
+  use IbanEx.Country.Template
 end
diff --git a/lib/iban_ex/country/lt.ex b/lib/iban_ex/country/lt.ex
index bc21e5b..dba384e 100644
--- a/lib/iban_ex/country/lt.ex
+++ b/lib/iban_ex/country/lt.ex
@@ -3,34 +3,8 @@ defmodule IbanEx.Country.LT do
   Lithuanian IBAN parsing rules
   """
 
-  alias IbanEx.Iban
-
-  @behaviour IbanEx.Country.Template
-
   @size 20
-
   @rule ~r/^(?<bank_code>[0-9]{5})(?<account_number>[0-9]{11})$/i
 
-  @spec size() :: 20
-  def size(), do: @size
-
-  @spec rule() :: Regex.t()
-  def rule(), do: @rule
-
-  @spec to_s(Iban.t()) :: binary()
-  @spec to_s(Iban.t(), binary()) :: binary()
-  def to_s(
-        %Iban{
-          country_code: country_code,
-          check_digits: check_digits,
-          bank_code: bank_code,
-          branch_code: _branch_code,
-          national_check: _national_check,
-          account_number: account_number
-        } = _iban,
-        joiner \\ " "
-      ) do
-    [country_code, check_digits, bank_code, account_number]
-    |> Enum.join(joiner)
-  end
+  use IbanEx.Country.Template
 end
diff --git a/lib/iban_ex/country/lu.ex b/lib/iban_ex/country/lu.ex
index f5dd419..3ebc71e 100644
--- a/lib/iban_ex/country/lu.ex
+++ b/lib/iban_ex/country/lu.ex
@@ -3,34 +3,8 @@ defmodule IbanEx.Country.LU do
   Luxembourg IBAN parsing rules
   """
 
-  alias IbanEx.Iban
-
-  @behaviour IbanEx.Country.Template
-
   @size 20
-
   @rule ~r/^(?<bank_code>[0-9]{3})(?<account_number>[0-9A-Z]{13})$/i
 
-  @spec size() :: 20
-  def size(), do: @size
-
-  @spec rule() :: Regex.t()
-  def rule(), do: @rule
-
-  @spec to_s(Iban.t()) :: binary()
-  @spec to_s(Iban.t(), binary()) :: binary()
-  def to_s(
-        %Iban{
-          country_code: country_code,
-          check_digits: check_digits,
-          bank_code: bank_code,
-          branch_code: _branch_code,
-          national_check: _national_check,
-          account_number: account_number
-        } = _iban,
-        joiner \\ " "
-      ) do
-    [country_code, check_digits, bank_code, account_number]
-    |> Enum.join(joiner)
-  end
+  use IbanEx.Country.Template
 end
diff --git a/lib/iban_ex/country/lv.ex b/lib/iban_ex/country/lv.ex
index 64829ee..ca6f5da 100644
--- a/lib/iban_ex/country/lv.ex
+++ b/lib/iban_ex/country/lv.ex
@@ -3,34 +3,8 @@ defmodule IbanEx.Country.LV do
   Latvian IBAN parsing rules
   """
 
-  alias IbanEx.Iban
-
-  @behaviour IbanEx.Country.Template
-
   @size 21
-
   @rule ~r/^(?<bank_code>[A-Z]{4})(?<account_number>[0-9A-Z]{13})$/i
 
-  @spec size() :: 21
-  def size(), do: @size
-
-  @spec rule() :: Regex.t()
-  def rule(), do: @rule
-
-  @spec to_s(Iban.t()) :: binary()
-  @spec to_s(Iban.t(), binary()) :: binary()
-  def to_s(
-        %Iban{
-          country_code: country_code,
-          check_digits: check_digits,
-          bank_code: bank_code,
-          branch_code: _branch_code,
-          national_check: _national_check,
-          account_number: account_number
-        } = _iban,
-        joiner \\ " "
-      ) do
-    [country_code, check_digits, bank_code, account_number]
-    |> Enum.join(joiner)
-  end
+  use IbanEx.Country.Template
 end
diff --git a/lib/iban_ex/country/mt.ex b/lib/iban_ex/country/mt.ex
index 3c944b9..596edfa 100644
--- a/lib/iban_ex/country/mt.ex
+++ b/lib/iban_ex/country/mt.ex
@@ -3,23 +3,15 @@ defmodule IbanEx.Country.MT do
   Malta IBAN parsing rules
   """
 
-  alias IbanEx.Iban
-
-  @behaviour IbanEx.Country.Template
-
   @size 31
-
   @rule ~r/^(?<bank_code>[A-Z]{4})(?<branch_code>[0-9]{5})(?<account_number>[0-9A-Z]{18})$/i
 
-  @spec size() :: 31
-  def size(), do: @size
+  use IbanEx.Country.Template
 
-  @spec rule() :: Regex.t()
-  def rule(), do: @rule
-
-  @spec to_s(Iban.t()) :: binary()
-  @spec to_s(Iban.t(), binary()) :: binary()
-  def to_s(
+  @impl IbanEx.Country.Template
+  @spec to_string(Iban.t()) :: binary()
+  @spec to_string(Iban.t(), binary()) :: binary()
+  def to_string(
         %Iban{
           country_code: country_code,
           check_digits: check_digits,
diff --git a/lib/iban_ex/country/nl.ex b/lib/iban_ex/country/nl.ex
index d910d30..b76534c 100644
--- a/lib/iban_ex/country/nl.ex
+++ b/lib/iban_ex/country/nl.ex
@@ -3,34 +3,8 @@ defmodule IbanEx.Country.NL do
   Netherlands IBAN parsing rules
   """
 
-  alias IbanEx.Iban
-
-  @behaviour IbanEx.Country.Template
-
   @size 18
-
   @rule ~r/^(?<bank_code>[A-Z]{4})(?<account_number>[0-9]{10})$/i
 
-  @spec size() :: 18
-  def size(), do: @size
-
-  @spec rule() :: Regex.t()
-  def rule(), do: @rule
-
-  @spec to_s(Iban.t()) :: binary()
-  @spec to_s(Iban.t(), binary()) :: binary()
-  def to_s(
-        %Iban{
-          country_code: country_code,
-          check_digits: check_digits,
-          bank_code: bank_code,
-          branch_code: _branch_code,
-          national_check: _national_check,
-          account_number: account_number
-        } = _iban,
-        joiner \\ " "
-      ) do
-    [country_code, check_digits, bank_code, account_number]
-    |> Enum.join(joiner)
-  end
+  use IbanEx.Country.Template
 end
diff --git a/lib/iban_ex/country/pl.ex b/lib/iban_ex/country/pl.ex
index 7c42790..e140bba 100644
--- a/lib/iban_ex/country/pl.ex
+++ b/lib/iban_ex/country/pl.ex
@@ -3,23 +3,15 @@ defmodule IbanEx.Country.PL do
   Poland IBAN parsing rules
   """
 
-  alias IbanEx.Iban
-
-  @behaviour IbanEx.Country.Template
-
   @size 28
-
   @rule ~r/^(?<bank_code>[0-9]{3})(?<branch_code>[0-9]{4})(?<national_check>[0-9]{1})(?<account_number>[0-9]{16})$/i
 
-  @spec size() :: 28
-  def size(), do: @size
+  use IbanEx.Country.Template
 
-  @spec rule() :: Regex.t()
-  def rule(), do: @rule
-
-  @spec to_s(Iban.t()) :: binary()
-  @spec to_s(Iban.t(), binary()) :: binary()
-  def to_s(
+  @impl IbanEx.Country.Template
+  @spec to_string(Iban.t()) :: binary()
+  @spec to_string(Iban.t(), binary()) :: binary()
+  def to_string(
         %Iban{
           country_code: country_code,
           check_digits: check_digits,
diff --git a/lib/iban_ex/country/pt.ex b/lib/iban_ex/country/pt.ex
index 6195bb8..5909178 100644
--- a/lib/iban_ex/country/pt.ex
+++ b/lib/iban_ex/country/pt.ex
@@ -3,23 +3,15 @@ defmodule IbanEx.Country.PT do
   Portugal IBAN parsing rules
   """
 
-  alias IbanEx.Iban
-
-  @behaviour IbanEx.Country.Template
-
   @size 25
-
   @rule ~r/^(?<bank_code>[0-9]{4})(?<branch_code>[0-9]{4})(?<account_number>[0-9]{11})(?<national_check>[0-9]{2})$/i
 
-  @spec size() :: 25
-  def size(), do: @size
+  use IbanEx.Country.Template
 
-  @spec rule() :: Regex.t()
-  def rule(), do: @rule
-
-  @spec to_s(Iban.t()) :: binary()
-  @spec to_s(Iban.t(), binary()) :: binary()
-  def to_s(
+  @impl IbanEx.Country.Template
+  @spec to_string(Iban.t()) :: binary()
+  @spec to_string(Iban.t(), binary()) :: binary()
+  def to_string(
         %Iban{
           country_code: country_code,
           check_digits: check_digits,
diff --git a/lib/iban_ex/country/template.ex b/lib/iban_ex/country/template.ex
index 7f761a0..a20f182 100644
--- a/lib/iban_ex/country/template.ex
+++ b/lib/iban_ex/country/template.ex
@@ -1,4 +1,6 @@
 defmodule IbanEx.Country.Template do
+  @moduledoc false
+
   alias IbanEx.Iban
   @type size() :: non_neg_integer()
   @type rule() :: Regex.t()
@@ -7,6 +9,41 @@ defmodule IbanEx.Country.Template do
 
   @callback size() :: size()
   @callback rule() :: rule()
-  @callback to_s(Iban.t(), joiner()) :: String.t()
-  @callback to_s(Iban.t()) :: String.t()
+  @callback to_string(Iban.t(), joiner()) :: String.t()
+  @callback to_string(Iban.t()) :: String.t()
+
+  defmacro __using__(_opts) do
+    quote do
+      alias IbanEx.Iban
+      @behaviour IbanEx.Country.Template
+
+      @impl IbanEx.Country.Template
+      @spec to_string(Iban.t()) :: binary()
+      @spec to_string(Iban.t(), binary()) :: binary()
+      def to_string(
+            %Iban{
+              country_code: country_code,
+              check_digits: check_digits,
+              bank_code: bank_code,
+              branch_code: _branch_code,
+              national_check: _national_check,
+              account_number: account_number
+            } = _iban,
+            joiner \\ " "
+          ) do
+        [country_code, check_digits, bank_code, account_number]
+        |> Enum.join(joiner)
+      end
+
+      @impl IbanEx.Country.Template
+      @spec size() :: Integer.t()
+      def size(), do: @size
+
+      @impl IbanEx.Country.Template
+      @spec rule() :: Regex.t()
+      def rule(), do: @rule
+
+      defoverridable to_string: 1, to_string: 2, size: 0, rule: 0
+    end
+  end
 end
diff --git a/lib/iban_ex/country/ua.ex b/lib/iban_ex/country/ua.ex
index 0b53d46..f09a508 100644
--- a/lib/iban_ex/country/ua.ex
+++ b/lib/iban_ex/country/ua.ex
@@ -3,34 +3,8 @@ defmodule IbanEx.Country.UA do
   Ukrainian IBAN parsing rules
   """
 
-  alias IbanEx.Iban
-
-  @behaviour IbanEx.Country.Template
-
   @size 29
-
   @rule ~r/^(?<bank_code>[0-9]{6})(?<account_number>[0-9A-Z]{19})$/i
 
-  @spec size() :: 29
-  def size(), do: @size
-
-  @spec rule() :: Regex.t()
-  def rule(), do: @rule
-
-  @spec to_s(Iban.t()) :: binary()
-  @spec to_s(Iban.t(), binary()) :: binary()
-  def to_s(
-        %Iban{
-          country_code: country_code,
-          check_digits: check_digits,
-          bank_code: bank_code,
-          branch_code: _branch_code,
-          national_check: _national_check,
-          account_number: account_number
-        } = _iban,
-        joiner \\ " "
-      ) do
-    [country_code, check_digits, bank_code, account_number]
-    |> Enum.join(joiner)
-  end
+  use IbanEx.Country.Template
 end