From 70e014c88a219cd20361ae1ac87d7fe599005458 Mon Sep 17 00:00:00 2001
From: borus-dev <smkbcross@gmail.com>
Date: Thu, 29 Jun 2023 15:24:04 +0200
Subject: [PATCH] docs: improved impersonating on fork documentation

---
 ...nate-any-address-as-a-simulation-sender.md | 27 +++++++++++++------
 1 file changed, 19 insertions(+), 8 deletions(-)

diff --git a/simulations-and-forks/reference/tenderly-fork-customization-via-api/how-to-impersonate-any-address-as-a-simulation-sender.md b/simulations-and-forks/reference/tenderly-fork-customization-via-api/how-to-impersonate-any-address-as-a-simulation-sender.md
index cd57fc5..d0e3c13 100644
--- a/simulations-and-forks/reference/tenderly-fork-customization-via-api/how-to-impersonate-any-address-as-a-simulation-sender.md
+++ b/simulations-and-forks/reference/tenderly-fork-customization-via-api/how-to-impersonate-any-address-as-a-simulation-sender.md
@@ -11,19 +11,23 @@ To achieve this, just send a transaction with any `from` address:
 ```tsx
 ...
 dotenv.config();
-const { TENDERLY_USER, TENDERLY_PROJECT, TENDERLY_ACCESS_KEY } = process.env;
+const { TENDERLY_USER, TENDERLY_PROJECT, TENDERLY_ACCESS_KEY, TENDERLY_FORK_ID } = process.env;
 
-const SIMULATE_API = `https://api.tenderly.co/api/v1/account/${TENDERLY_USER}/project/${TENDERLY_PROJECT}/simulate`
+const SIMULATE_API = `https://api.tenderly.co/api/v1/account/${TENDERLY_USER}/project/${TENDERLY_PROJECT}/fork/${TENDERLY_FORK_ID}/simulate`;
+
+const provider = new ethers.providers.JsonRpcProvider(process.env.TENDERLY_FORK_URL);
 
 const DAI_ADDRESS = "0x6b175474e89094c44da98b954eedeac495271d0f";
 
-// tx data obtained using other means
-const TX_DATA = await contract.populateTransaction[funcName](...args);
+// DAI contract instance
+const dai = ERC20__factory.connect(DAI_ADDRESS, provider);
+
+const TX_DATA = await dai.populateTransaction[funcName](...args);
 
 const transaction = {
     network_id: '1',
     from: "0x0000000000000000000000000000000000000000",
-    input: TX_DATA,
+    input: TX_DATA.data,
     to: DAI_ADDRESS,
     block_number: null,
     // tenderly specific
@@ -32,9 +36,16 @@ const transaction = {
 
 const opts = {
     headers: {
-        'X-Access-Key': process.env.TENDERLY_ACCESS_KEY || "",
+        "content-type": "application/JSON",
+        'X-Access-Key': TENDERLY_ACCESS_KEY || "",
     }
 }
-const resp = await axios.post(SIMULATE_API, transaction, opts);
-console.log(resp.data);
+
+try {
+    const resp = await axios.post(SIMULATE_API, transaction, opts);
+    console.log(resp.data);
+} catch (err: any) {
+    console.log(err.response.data.error);
+}
+
 ```