From d6af759404a0e7e3b5cfc3343826e97d958e3221 Mon Sep 17 00:00:00 2001
From: Thrilok Kumar <thrilok2000@gmail.com>
Date: Mon, 3 May 2021 22:20:26 +0530
Subject: [PATCH] Fixed paraswp approve issue

---
 contracts/polygon/connectors/paraswap/helpers.sol   | 4 +++-
 contracts/polygon/connectors/paraswap/interface.sol | 5 +++++
 2 files changed, 8 insertions(+), 1 deletion(-)
 create mode 100644 contracts/polygon/connectors/paraswap/interface.sol

diff --git a/contracts/polygon/connectors/paraswap/helpers.sol b/contracts/polygon/connectors/paraswap/helpers.sol
index 4edcc657..3a54f10f 100644
--- a/contracts/polygon/connectors/paraswap/helpers.sol
+++ b/contracts/polygon/connectors/paraswap/helpers.sol
@@ -3,6 +3,7 @@ pragma solidity ^0.7.0;
 import { DSMath } from "../../common/math.sol";
 import { Basic } from "../../common/basic.sol";
 import { TokenInterface } from "../../common/interfaces.sol";
+import { AugustusSwapperInterface } from "./interface.sol";
 
 abstract contract Helpers is DSMath, Basic {
 
@@ -43,7 +44,8 @@ abstract contract Helpers is DSMath, Basic {
         if (address(_sellAddr) == maticAddr) {
             maticAmt = swapData._sellAmt;
         } else {
-            TokenInterface(_sellAddr).approve(paraswap, swapData._sellAmt);
+            address tokenProxy = AugustusSwapperInterface(paraswap).getTokenTransferProxy();
+            TokenInterface(_sellAddr).approve(tokenProxy, swapData._sellAmt);
         }
 
         swapData._buyAmt = _swapHelper(swapData, maticAmt);
diff --git a/contracts/polygon/connectors/paraswap/interface.sol b/contracts/polygon/connectors/paraswap/interface.sol
new file mode 100644
index 00000000..a63b4c77
--- /dev/null
+++ b/contracts/polygon/connectors/paraswap/interface.sol
@@ -0,0 +1,5 @@
+pragma solidity ^0.7.0;
+
+interface AugustusSwapperInterface {
+    function getTokenTransferProxy() external view returns (address);
+}
\ No newline at end of file