Redeeming Smart Sessions Permissions

import { 
  toNexusAccount,
  createSmartAccountClient,
  smartSessionActions
} from '@biconomy/abstractjs';
import { http } from 'viem';
 
// Initialize the redeemer's account
const redeemerAccount = yourRedeemerAccount; // The account that received permission
 
// Create a Nexus account pointing to the original account address
const emulatedAccount = await toNexusAccount({
  accountAddress: nexusAccount.address, // The address that granted the permission
  signer: redeemerAccount,
  chain,
  transport: http(rpcUrl)
});
 
// Create a client for the emulated account
const emulatedClient = createSmartAccountClient({
  account: emulatedAccount,
  transport: http(bundlerUrl),
  mock: true // Set to false in production
});
 
// Extend the client with Smart Sessions actions
const smartSessionsClient = emulatedClient.extend(smartSessionActions());

// Use the permission with the sessionDetails received during grant
const userOpHash = await smartSessionsClient.usePermission({
  sessionDetails, // The session details object returned from grantPermission
  calls: [
    { 
      to: targetContractAddress, // The target contract address
      data: "0x273ea3e3" // The function selector (e.g., increment())
    }
  ],
  mode: "ENABLE_AND_USE" // Use "ENABLE_AND_USE" for the first usage, "USE" for subsequent uses
});
 
// Wait for the transaction to be processed
const receipt = await emulatedClient.waitForUserOperationReceipt({
  hash: userOpHash
});
 
// Check if the transaction was successful
if (!receipt.success) {
  throw new Error("Smart sessions module validation failed");
}
 
console.log("Permission used successfully:", receipt);

// Use the permission again without enabling it
const secondUserOpHash = await smartSessionsClient.usePermission({
  sessionDetails,
  calls: [
    { 
      to: targetContractAddress,
      data: "0x273ea3e3" 
    }
  ],
  mode: "USE" // Only "USE" for subsequent usages
});
 
const secondReceipt = await emulatedClient.waitForUserOperationReceipt({
  hash: secondUserOpHash
});
 
console.log("Permission used again successfully:", secondReceipt);