diff --git a/lib/Services/Bridge.php b/lib/Services/Bridge.php
index 30c9e29f3e..a62d12f28c 100644
--- a/lib/Services/Bridge.php
+++ b/lib/Services/Bridge.php
@@ -64,11 +64,17 @@ class Bridge {
     $state_map = array(
       200 => self::PREMIUM_KEY_VALID,
       401 => self::PREMIUM_KEY_INVALID,
-      402 => self::PREMIUM_KEY_EXPIRING
+      402 => self::PREMIUM_KEY_ALREADY_USED
     );
 
     if(!empty($result['code']) && isset($state_map[$result['code']])) {
-      $key_state = $state_map[$result['code']];
+      if($state_map[$result['code']] == self::PREMIUM_KEY_VALID
+        && !empty($result['data']['expire_at'])
+      ) {
+        $key_state = self::PREMIUM_KEY_EXPIRING;
+      } else {
+        $key_state = $state_map[$result['code']];
+      }
     } else {
       $key_state = self::PREMIUM_KEY_CHECK_ERROR;
     }
diff --git a/tests/unit/Services/BridgeTest.php b/tests/unit/Services/BridgeTest.php
index 4988efb82f..412a32df82 100644
--- a/tests/unit/Services/BridgeTest.php
+++ b/tests/unit/Services/BridgeTest.php
@@ -14,7 +14,8 @@ class BridgeTest extends \MailPoetTest {
   function _before() {
     $this->valid_key = 'abcdefghijklmnopqrstuvwxyz';
     $this->invalid_key = '401' . $this->valid_key;
-    $this->expiring_key = '402' . $this->valid_key;
+    $this->expiring_key = 'expiring' . $this->valid_key;
+    $this->used_key = '402' . $this->valid_key;
     $this->uncheckable_key = '503' . $this->valid_key;
 
     $this->expiring_premium_key = 'expiring' . $this->valid_key;
@@ -67,6 +68,12 @@ class BridgeTest extends \MailPoetTest {
     expect($result['data']['expire_at'])->notEmpty();
   }
 
+  function testItChecksAlreadyUsed() {
+    $result = $this->bridge->checkMSSKey($this->used_key);
+    expect($result)->notEmpty();
+    expect($result['state'])->equals(Bridge::PREMIUM_KEY_ALREADY_USED);
+  }
+
   function testItReturnsErrorStateOnEmptyAPIResponseCodeDuringMSSCheck() {
     $api = Stub::make(new API(null), array('checkMSSKey' => array()), $this);
     $this->bridge->api = $api;
diff --git a/tests/unit/Services/BridgeTestMockAPI.php b/tests/unit/Services/BridgeTestMockAPI.php
index ac0f1eafdf..d1e4b41f3a 100644
--- a/tests/unit/Services/BridgeTestMockAPI.php
+++ b/tests/unit/Services/BridgeTestMockAPI.php
@@ -14,7 +14,7 @@ class BridgeTestMockAPI {
 
   function checkMSSKey() {
     // if a key begins with these codes, return them
-    $regex = '/^(401|402|503)/';
+    $regex = '/^(expiring|401|402|503)/';
     $code = preg_match($regex, $this->api_key, $m) ? $m[1] : 200;
     return $this->processAPICheckResponse($code);
   }
@@ -40,16 +40,17 @@ class BridgeTestMockAPI {
 
   private function processAPICheckResponse($code) {
     switch($code) {
-      case 200:
-        $body = array('subscriber_limit' => 10000);
-        break;
-      case 402:
+      case 'expiring':
+        // a special case of a valid key
+        $code = 200;
         $body = array(
           'subscriber_limit' => 10000,
           'expire_at' => Carbon::createFromTimestamp(current_time('timestamp'))
             ->addMonth()->format('c')
         );
         break;
+      case 200:
+      case 401:
       case 401:
       default:
         $body = null;