Инициализировано Yii2 приложение, выпилены лишние части, накинуты чуточку нужных

api/config/.gitignore

@@ -0,0 +1,2 @@
+main-local.php
+params-local.php

api/config/bootstrap.php

@@ -0,0 +1 @@
+<?php

api/config/main.php

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+<?php
+$params = array_merge(
+    require(__DIR__ . '/../../common/config/params.php'),
+    require(__DIR__ . '/../../common/config/params-local.php'),
+    require(__DIR__ . '/params.php'),
+    require(__DIR__ . '/params-local.php')
+);
+
+return [
+    'id' => 'accounts-site-api',
+    'basePath' => dirname(__DIR__),
+    'bootstrap' => ['log'],
+    'controllerNamespace' => 'api\controllers',
+    'components' => [
+        'user' => [
+            'identityClass' => 'common\models\User',
+            'enableAutoLogin' => true,
+        ],
+        'log' => [
+            'traceLevel' => YII_DEBUG ? 3 : 0,
+            'targets' => [
+                [
+                    'class' => 'yii\log\FileTarget',
+                    'levels' => ['error', 'warning'],
+                ],
+            ],
+        ],
+        'errorHandler' => [
+            'errorAction' => 'site/error',
+        ],
+    ],
+    'params' => $params,
+];

api/config/params.php

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+<?php
+return [
+    'adminEmail' => 'admin@example.com',
+];