Privy Wallet Provider

{
  "owner": { "user_id": "did:privy:…" },
  "additional_signers": [{ "signer_id": "<your key quorum id>" }]
}

{
  "chain_type": "ethereum",
  "owner": { "user_id": "did:privy:…" },
  "additional_signers": [{ "signer_id": "<your signer id>" }]
}

import { usePrivy, useSigners } from "@privy-io/react-auth";

// YOUR Privy key quorum ID — the same value you entered as "Signer ID" under
// Settings → Wallet Provider in AGG. It is not issued by AGG: it comes from
// your Privy dashboard, and the quorum must contain the authorization key
// you saved in AGG.
const YOUR_PRIVY_SIGNER_ID = "<your-privy-key-quorum-id>";

export function useAddSignerToWallets() {
  const { user } = usePrivy();
  const { addSigners } = useSigners();

  return async function addSignerToWallets() {
    // Your users' Privy embedded wallets, on both chains — AGG signs on each.
    const wallets = (user?.linkedAccounts ?? []).filter(
      (account) =>
        account.type === "wallet" &&
        account.walletClientType === "privy",
    );

    for (const wallet of wallets) {
      try {
        await addSigners({
          address: wallet.address,
          signers: [{ signerId: YOUR_PRIVY_SIGNER_ID }],
        });
      } catch (err) {
        // Privy rejects adding a signer the wallet already has. That means this
        // wallet is already set up — skip it and continue with the next one.
        if (String((err as Error)?.message).includes("Duplicate signer")) continue;
        throw err;
      }
    }
  };
}