From c0ac6305b355f6c02426d401d48aa28c4c5a0051 Mon Sep 17 00:00:00 2001
From: shrouti1507 <shrouti.gangopadhyay@gmail.com>
Date: Thu, 16 Nov 2023 15:26:10 +0530
Subject: [PATCH] fix: edited distinct id logic

---
 src/v0/destinations/mp/transform.js | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/v0/destinations/mp/transform.js b/src/v0/destinations/mp/transform.js
index ac1209194e..9e80be68cd 100644
--- a/src/v0/destinations/mp/transform.js
+++ b/src/v0/destinations/mp/transform.js
@@ -234,6 +234,11 @@ const createSetOnceResponse = (message, type, destination, setOnce) => {
     $token: destination.Config.token,
     $distinct_id: message.userId || message.anonymousId,
   };
+
+  if (destination?.Config.identityMergeApi === 'simplified') {
+    payload.$distinct_id = message.userId || `$device:${message.anonymousId}`;
+  }
+
   return responseBuilderSimple(payload, message, type, destination.Config);
 };