Draft: Start of Paytr integration

packages/payment-processor/src/payment/paytr.ts

@@ -0,0 +1,43 @@
+import { constants, BigNumberish, BigNumber, ethers } from 'ethers';
+
+import { ClientTypes } from '@requestnetwork/types';
+// import { getPaymentNetworkExtension } from '@requestnetwork/payment-detection';
+// import { EvmChains } from '@requestnetwork/currency';
+
+//import { ITransactionOverrides } from './transaction-overrides';
+import {
+  getAmountToPay,
+  //getProvider,
+  getRequestPaymentValues,
+  //getSigner,
+  validateErc20FeeProxyRequest,
+  //validateRequest,
+} from './utils';
+//import { IPreparedTransaction } from './prepared-transaction';
+
+//Paytr custom import
+import { abi as ABI_0_1_0 } from '@requestnetwork/smart-contracts/src/lib/artifacts/Paytr/0.1.0.json';
+
+export function encodePayErc20FeeRequest(
+  request: ClientTypes.IRequestData,
+  amount?: BigNumberish,
+  feeAmountOverride?: BigNumberish,
+): string {
+  validateErc20FeeProxyRequest(request, amount, feeAmountOverride);
+
+  const tokenAddress = request.currencyInfo.value;
+  const { paymentReference, paymentAddress, feeAddress, feeAmount } =
+    getRequestPaymentValues(request);
+  const amountToPay = getAmountToPay(request, amount);
+  const feeToPay = BigNumber.from(feeAmountOverride || feeAmount || 0);
+  const paytrInterface = new ethers.utils.Interface(ABI_0_1_0);
+
+  return paytrInterface.encodeFunctionData('payOutERC20Invoice', [
+    tokenAddress,
+    paymentAddress,
+    amountToPay,
+    `0x${paymentReference}`,
+    feeToPay,
+    feeAddress || constants.AddressZero,
+  ]);
+}