Add clear to the valid values for the tag parameter

Part of STF-190. The `clear` tag retracts a previously reported fraud
report tag on a transaction, restoring its label to "unknown" (distinct
from the positive `not_fraud` signal). Backend support shipped in
STF-15; this adds SDK support.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: oschwald

CHANGELOG.md

@@ -9,6 +9,8 @@ CHANGELOG
   [Device Tracking Add-on](https://dev.maxmind.com/minfraud/track-devices)
   for explicit device linking.
 * Added `fat_zebra` to the payment processor validation.
+* Added `clear` to the valid values for the `tag` parameter on the Report
+  Transaction API.
 
 3.6.0 (2026-01-20)
 ------------------

src/MinFraud/ReportTransaction.php

@@ -53,8 +53,8 @@ public function __construct(
      *                                             `maxmindId`, `minfraudId`, or `transactionId`.
      * @param string               $tag            Required. A string indicating the likelihood that a
      *                                             transaction may be fraudulent. Possible values:
-     *                                             not_fraud, suspected_fraud, spam_or_abuse, or
-     *                                             chargeback.
+     *                                             not_fraud, suspected_fraud, spam_or_abuse,
+     *                                             chargeback, or clear.
      * @param string               $chargebackCode Optional. A string which is provided by your payment
      *                                             processor indicating the reason for the chargeback.
      * @param string               $maxmindId      Optional. A unique eight character string identifying
@@ -159,9 +159,9 @@ public function report(
             // This is required so we always throw an exception if it is not set
             throw new InvalidInputException('A tag is required');
         }
-        if (!\in_array($tag, ['not_fraud', 'suspected_fraud', 'spam_or_abuse', 'chargeback'], true)) {
+        if (!\in_array($tag, ['not_fraud', 'suspected_fraud', 'spam_or_abuse', 'chargeback', 'clear'], true)) {
             $this->maybeThrowInvalidInputException(
-                "$tag must be one of 'not_fraud', 'suspected_fraud', 'spam_or_abuse', or 'chargeback'",
+                "$tag must be one of 'not_fraud', 'suspected_fraud', 'spam_or_abuse', 'chargeback', or 'clear'",
             );
         }
         $values['tag'] = $tag;

tests/MaxMind/Test/MinFraud/ReportTransaction/ReportTransactionTest.php

@@ -58,6 +58,12 @@ public function testRequiredFields(): void
         ];
         $this->createReportTransactionRequest($req, 1)->report($req);
 
+        $req = [
+            'ip_address' => '1.1.1.1',
+            'tag' => 'clear',
+        ];
+        $this->createReportTransactionRequest($req, 1)->report($req);
+
         $req = [
             'maxmind_id' => '12345678',
             'tag' => 'not_fraud',