diff --git a/CHANGELOG.md b/CHANGELOG.md
index 979735c..cb4a449 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,6 +8,7 @@ CHANGELOG
   token generated by the
   [Device Tracking Add-on](https://dev.maxmind.com/minfraud/track-devices)
   for explicit device linking.
+* Added `fat_zebra` to the payment processor validation.
 
 3.6.0 (2026-01-20)
 ------------------
diff --git a/src/MinFraud.php b/src/MinFraud.php
index 20ec2d3..731e410 100644
--- a/src/MinFraud.php
+++ b/src/MinFraud.php
@@ -902,6 +902,7 @@ public function withPayment(
                 'epx',
                 'eway',
                 'exact',
+                'fat_zebra',
                 'first_atlantic_commerce',
                 'first_data',
                 'fiserv',