diff --git a/HISTORY.rst b/HISTORY.rst
index 22ae1a3..5e38cb8 100644
--- a/HISTORY.rst
+++ b/HISTORY.rst
@@ -9,6 +9,7 @@ History
 * The minFraud Factors subscores have been deprecated. They will be removed
   in March 2025. Please see `our release notes <https://dev.maxmind.com/minfraud/release-notes/2024/#deprecation-of-risk-factor-scoressubscores>`_
   for more information.
+* Added ``epayco`` to the ``/payment/processor`` validation.
 
 2.12.0b1 (2024-09-06)
 +++++++++++++++++++++
diff --git a/minfraud/validation.py b/minfraud/validation.py
index ec2d85f..dcd704f 100644
--- a/minfraud/validation.py
+++ b/minfraud/validation.py
@@ -145,6 +145,7 @@ def _hostname(hostname: str) -> str:
         "elavon",
         "emerchantpay",
         "epay",
+        "epayco",
         "eprocessing_network",
         "epx",
         "eway",