newsupernova/vendor/amzn/login-with-amazon-module/etc/adminhtml/system.xml

<?xml version="1.0"?>
<!--
/**
 * Copyright 2016 Amazon.com, Inc. or its affiliates. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License").
 * You may not use this file except in compliance with the License.
 * A copy of the License is located at
 *
 *  http://aws.amazon.com/apache2.0
 *
 * or in the "license" file accompanying this file. This file is distributed
 * on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
 * express or implied. See the License for the specific language governing
 * permissions and limitations under the License.
 */
-->
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:module:Magento_Config:etc/system_file.xsd">
    <system>
        <section id="payment">
            <group id="amazon_payment">
                <group id="advanced">
                    <group id="frontend">
                        <field id="amazon_login_in_popup" translate="label comment" type="select" sortOrder="60" showInDefault="1" showInWebsite="1" showInStore="1">
                            <label>Show Login with Amazon in authentication popup</label>
                            <source_model>Magento\Config\Model\Config\Source\Yesno</source_model>
                            <config_path>payment/amazon_payment/amazon_login_in_popup</config_path>
                            <comment><![CDATA[Displays Login with Amazon Pay option in Magento's account login popup.]]></comment>
                        </field>
                    </group>
                </group>
            </group>
        </section>
    </system>
</config>