remove unused files

modules/ppcp-wc-gateway/.gitignore

@@ -1,2 +0,0 @@
-vendor
-build

modules/ppcp-wc-gateway/composer.json

@@ -1,20 +0,0 @@
-{
-  "name": "inpsyde/ppcp-wc-gateway",
-  "type": "inpsyde-module",
-  "require": {
-    "dhii/module-interface": "0.2.x-dev",
-    "inpsyde/ppcp-session": "dev-master",
-    "inpsyde/ppcp-admin-notices": "dev-master",
-    "inpsyde/ppcp-api-client": "dev-master"
-  },
-  "scripts": {
-    "unit": "./vendor/bin/phpunit --coverage-html build/coverage-report"
-  },
-  "require-dev": {
-    "phpunit/phpunit": "^9.1",
-    "brain/monkey": "^2.4",
-    "inpsyde/php-coding-standards": "^1"
-  },
-  "minimum-stability": "dev",
-  "prefer-stable": true
-}

modules/ppcp-wc-gateway/phpunit.xml.dist

@@ -1,20 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<phpunit
-        bootstrap="vendor/autoload.php"
-        backupGlobals="false"
-        colors="true"
-        convertErrorsToExceptions="true"
-        convertNoticesToExceptions="true"
-        convertWarningsToExceptions="true"
->
-    <filter>
-        <whitelist processUncoveredFilesFromWhitelist="true">
-            <directory suffix=".php">./src</directory>
-        </whitelist>
-    </filter>
-    <testsuites>
-        <testsuite name="unit">
-            <directory suffix="Test.php">./tests/PHPUnit</directory>
-        </testsuite>
-    </testsuites>
-</phpunit>