サブスクリプション権限の作成

import { address, createClient } from '@solana/kit';
import { solanaLocalRpc } from '@solana/kit-plugin-rpc';
import { signer } from '@solana/kit-plugin-signer';
import { findAssociatedTokenPda, TOKEN_PROGRAM_ADDRESS } from '@solana-program/token';
import {
  fetchMaybeSubscriptionAuthority,
  findSubscriptionAuthorityPda,
  subscriptionsProgram,
} from '@solana/subscriptions';

const client = createClient()
  .use(signer(userSigner))
  .use(solanaLocalRpc({ rpcUrl: 'http://127.0.0.1:8899' }))
  .use(subscriptionsProgram());

const tokenMint = address('TOKEN_MINT_ADDRESS_HERE');
const [userAta] = await findAssociatedTokenPda({
  mint: tokenMint,
  owner: userSigner.address,
  tokenProgram: TOKEN_PROGRAM_ADDRESS,
});

const [subscriptionAuthorityPda] = await findSubscriptionAuthorityPda({
  user: userSigner.address,
  tokenMint,
});

const subscriptionAuthority = await fetchMaybeSubscriptionAuthority(
  client.rpc,
  subscriptionAuthorityPda,
);

if (!subscriptionAuthority.exists) {
  await client.subscriptions.instructions
    .initSubscriptionAuthority({
      tokenMint,
      tokenProgram: TOKEN_PROGRAM_ADDRESS,
      userAta,
    })
    .sendTransaction();
}