Update sui-support.md

docs/develop/asset-transfer-via-nitro/tools/nitro-pathfinder-api/performing-cross-chain-transaction/sui-support.md

@@ -9,8 +9,22 @@ For Sui, only the signing and sending trasaction will be different.
 ```jsx
 import { TransactionBlock } from "@mysten/sui.js/transactions";
 import { getFullnodeUrl, SuiClient } from "@mysten/sui/client";
+import { Ed25519Keypair } from "@mysten/sui/keypairs/ed25519";
+import { ethers } from "ethers";
 
 const main = async () => {
+
+    // configure your private_key
+    const signer = Ed25519Keypair.fromSecretKey(
+      Uint8Array.from(
+        ethers.getBytes(
+          private_key.startsWith("0x") ? private_key : `0x${private_key}`
+        )
+      )
+    );
+
+    // wallet address can be derived if required
+    // const wallet = signer.getPublicKey().toSuiAddress();
 
     // get transaction data same as evm
     const txResponse = await getTransaction(quoteData); // quoteData has been fetched in step 1
@@ -20,12 +34,32 @@ const main = async () => {
     const client = new SuiClient({ url: rpcUrl });
 
     // sending the transaction using the data given by the pathfinder
-    const byteArray = hexToUint8Array(txResponse.data);
+    const byteArray = hexToUint8Array(txResponse.data); // convert api tnx hex data to tnx byte array
     const transactionBlock = TransactionBlock.from(byteArray);
-    const result = await signAndSendTx(client, transactionBlock, walletAddress)
+    const result = await signAndSendTx(client, transactionBlock, signer)
 
     console.log(`txHash ${result.digest}`);
 }
 
+async function signAndSendTx(
+  client: SuiClient,
+  txb: Transaction | Uint8Array,
+  signer: typeof Ed25519Keypair
+) {
+  return await client.signAndExecuteTransaction({
+    transaction: txb,
+    signer,
+    requestType: "WaitForLocalExecution",
+    options: {
+      showEffects: true,
+      showEvents: true,
+      showRawInput: true,
+      showInput: true,
+      showBalanceChanges: true,
+      showObjectChanges: true,
+    },
+  });
+}
+
 main()
-```
+```