etc/adminhtml/system.xml
<?xml version="1.0"?>
<!--
~ SOZO Design Ltd
~
~ NOTICE OF LICENSE
~
~ This source file is subject to the Open Software License (OSL 3.0)
~ that is bundled with this package in the file LICENSE.
~ It is also available through the world-wide-web at this URL:
~ http://opensource.org/licenses/osl-3.0.php
~
~ @category SOZO Design Ltd
~ @package Sozo_CurrencyConversionExtended
~ @copyright Copyright (c) 2019 SOZO Design Ltd (https://sozodesign.com)
~ @license http://opensource.org/licenses/osl-3.0.php Open Software License (OSL 3.0)
-->
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:noNamespaceSchemaLocation="urn:magento:module:Magento_Config:etc/system_file.xsd">
<system>
<section id="currency">
<group id="currency_converter" translate="label" sortOrder="41" showInDefault="1" showInWebsite="0"
showInStore="0">
<label>The Free Currency Converter API (SOZO)</label>
<field id="api_key" translate="label" type="obscure" sortOrder="5" showInDefault="1" showInWebsite="0"
showInStore="0">
<label>API Key</label>
<backend_model>Magento\Config\Model\Config\Backend\Encrypted</backend_model>
</field>
<field id="timeout" translate="label" type="text" sortOrder="10" showInDefault="1" showInWebsite="0"
showInStore="0">
<label>Connection Timeout in Seconds</label>
<comment>
<![CDATA[
You can find more information about this free converter on the developers website <a href="https://free.currencyconverterapi.com" target="_blank">free.currencyconverterapi.com</a>
]]>
</comment>
</field>
</group>
<group id="open_rates" translate="label" sortOrder="42" showInDefault="1" showInWebsite="0"
showInStore="0">
<label>OpenRates.io</label>
<field id="timeout" translate="label" type="text" sortOrder="10" showInDefault="1" showInWebsite="0"
showInStore="0">
<label>Connection Timeout in Seconds</label>
<comment>
<![CDATA[
You can find more information about this free converter on the developers website <a href="https://openrates.io" target="_blank">openrates.io</a>
]]>
</comment>
</field>
</group>
</section>
</system>
</config>