diff --git a/packages/payment-processor/src/payment/swap-erc20-fee-proxy.ts b/packages/payment-processor/src/payment/swap-erc20-fee-proxy.ts
index d03697fdc3..dcf7d8ba21 100644
--- a/packages/payment-processor/src/payment/swap-erc20-fee-proxy.ts
+++ b/packages/payment-processor/src/payment/swap-erc20-fee-proxy.ts
@@ -8,11 +8,13 @@ import { ITransactionOverrides } from './transaction-overrides';
 import {
   getAmountToPay,
   getProvider,
+  getProxyAddress,
   getRequestPaymentValues,
   getSigner,
   validateErc20FeeProxyRequest,
 } from './utils';
 import { IPreparedTransaction } from './prepared-transaction';
+import { Erc20PaymentNetwork } from '@requestnetwork/payment-detection';
 
 /**
  * Details required for a token swap:
@@ -131,10 +133,16 @@ export function encodeSwapToPayErc20FeeRequest(
     throw new Error('Request currency network is missing');
   }
 
+  const feeProxyAddress = getProxyAddress(
+    request,
+    Erc20PaymentNetwork.ERC20FeeProxyPaymentDetector.getDeploymentInformation,
+  );
+
   const swapToPayAddress = erc20FeeProxyArtifact.getAddress(request.currencyInfo.network);
   const swapToPayContract = ERC20SwapToPay__factory.connect(swapToPayAddress, signer);
 
   return swapToPayContract.interface.encodeFunctionData('swapTransferWithReference', [
+    feeProxyAddress,
     paymentAddress,
     amountToPay,
     swapSettings.maxInputAmount,
diff --git a/packages/payment-processor/test/payment/encoder-payment.test.ts b/packages/payment-processor/test/payment/encoder-payment.test.ts
index 8601cb3909..f3338b0ac7 100644
--- a/packages/payment-processor/test/payment/encoder-payment.test.ts
+++ b/packages/payment-processor/test/payment/encoder-payment.test.ts
@@ -318,7 +318,7 @@ describe('Payment encoder handles ERC20 Swap Proxy', () => {
     );
 
     expect(paymentTransaction).toEqual({
-      data: '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',
+      data: '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',
       to: proxyAddress,
       value: 0,
     });
diff --git a/packages/payment-processor/test/payment/swap-erc20-fee-proxy.test.ts b/packages/payment-processor/test/payment/swap-erc20-fee-proxy.test.ts
index d395917041..a0d2a15342 100644
--- a/packages/payment-processor/test/payment/swap-erc20-fee-proxy.test.ts
+++ b/packages/payment-processor/test/payment/swap-erc20-fee-proxy.test.ts
@@ -57,7 +57,7 @@ const validRequest: ClientTypes.IRequestData = {
         paymentAddress,
         salt: 'salt',
       },
-      version: '1.0',
+      version: '0.1.0',
     },
   },
   extensionsData: [],
@@ -146,7 +146,7 @@ describe('swap-erc20-fee-proxy', () => {
         wallet,
         {
           deadline: 2599732187000, // This test will fail in 2052
-          maxInputAmount: 204,
+          maxInputAmount: 206,
           path: [alphaErc20Address, erc20ContractAddress],
         },
         {
@@ -154,7 +154,7 @@ describe('swap-erc20-fee-proxy', () => {
         },
       );
       expect(spy).toHaveBeenCalledWith({
-        data: '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',
+        data: '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',
         gasPrice: '20000000000',
         to: '0xA4392264a2d8c998901D10C154C91725b1BF0158',
         value: 0,
@@ -191,8 +191,8 @@ describe('swap-erc20-fee-proxy', () => {
 
       // Swap and pay
       const tx = await swapErc20FeeProxyRequest(validRequest, wallet, {
-        deadline: Date.now() + 1000,
-        maxInputAmount: 204,
+        deadline: Date.now() + 10000,
+        maxInputAmount: 206,
         path: [alphaErc20Address, erc20ContractAddress],
       });
       const confirmedTx = await tx.wait(1);