Configure group for core payment methods to improve UX of default payment methods source model. It fixes #19664

Author: wojtekn

app/code/Magento/Authorizenet/etc/config.xml

@@ -32,6 +32,7 @@
                 <cgi_url>https://secure.authorize.net/gateway/transact.dll</cgi_url>
                 <cgi_url_td_test_mode>https://apitest.authorize.net/xml/v1/request.api</cgi_url_td_test_mode>
                 <cgi_url_td>https://api2.authorize.net/xml/v1/request.api</cgi_url_td>
+                <group>authorizenet</group>
             </authorizenet_directpost>
         </payment>
     </default>

app/code/Magento/Authorizenet/etc/payment.xml

@@ -0,0 +1,15 @@
+<?xml version="1.0"?>
+<!--
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+-->
+<payment xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:noNamespaceSchemaLocation="urn:magento:module:Magento_Payment:etc/payment.xsd">
+    <groups>
+        <group id="authorizenet">
+            <label>Authorize.net</label>
+        </group>
+    </groups>
+</payment>

app/code/Magento/Braintree/etc/config.xml

@@ -42,6 +42,7 @@
                 <paymentInfoKeys>cc_type,cc_number,avsPostalCodeResponseCode,avsStreetAddressResponseCode,cvvResponseCode,processorAuthorizationCode,processorResponseCode,processorResponseText,liabilityShifted,liabilityShiftPossible,riskDataId,riskDataDecision</paymentInfoKeys>
                 <avs_ems_adapter>Magento\Braintree\Model\AvsEmsCodeMapper</avs_ems_adapter>
                 <cvv_ems_adapter>Magento\Braintree\Model\CvvEmsCodeMapper</cvv_ems_adapter>
+                <group>braintree</group>
             </braintree>
             <braintree_paypal>
                 <model>BraintreePayPalFacade</model>
@@ -67,6 +68,7 @@
                 <privateInfoKeys>processorResponseCode,processorResponseText,paymentId</privateInfoKeys>
                 <paymentInfoKeys>processorResponseCode,processorResponseText,paymentId,payerEmail</paymentInfoKeys>
                 <supported_locales>en_US,en_GB,en_AU,da_DK,fr_FR,fr_CA,de_DE,zh_HK,it_IT,nl_NL,no_NO,pl_PL,es_ES,sv_SE,tr_TR,pt_BR,ja_JP,id_ID,ko_KR,pt_PT,ru_RU,th_TH,zh_CN,zh_TW</supported_locales>
+                <group>braintree</group>
             </braintree_paypal>
             <braintree_cc_vault>
                 <model>BraintreeCreditCardVaultFacade</model>
@@ -76,6 +78,7 @@
                     <tokenFormat>Magento\Braintree\Model\InstantPurchase\CreditCard\TokenFormatter</tokenFormat>
                     <additionalInformation>Magento\Braintree\Model\InstantPurchase\PaymentAdditionalInformationProvider</additionalInformation>
                 </instant_purchase>
+                <group>braintree</group>
             </braintree_cc_vault>
             <braintree_paypal_vault>
                 <model>BraintreePayPalVaultFacade</model>
@@ -85,6 +88,7 @@
                     <tokenFormat>Magento\Braintree\Model\InstantPurchase\PayPal\TokenFormatter</tokenFormat>
                     <additionalInformation>Magento\Braintree\Model\InstantPurchase\PaymentAdditionalInformationProvider</additionalInformation>
                 </instant_purchase>
+                <group>braintree</group>
             </braintree_paypal_vault>
         </payment>
     </default>

app/code/Magento/Braintree/etc/payment.xml

@@ -0,0 +1,15 @@
+<?xml version="1.0"?>
+<!--
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+-->
+<payment xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:noNamespaceSchemaLocation="urn:magento:module:Magento_Payment:etc/payment.xsd">
+    <groups>
+        <group id="braintree">
+            <label>Braintree</label>
+        </group>
+    </groups>
+</payment>

app/code/Magento/Paypal/etc/config.xml

@@ -100,6 +100,7 @@
                 <instant_purchase>
                     <tokenFormat>\Magento\Paypal\Model\InstantPurchase\Payflow\Pro\TokenFormatter</tokenFormat>
                 </instant_purchase>
+                <group>paypal</group>
             </payflowpro_cc_vault>
             <paypal_billing_agreement>
                 <active>1</active>