Create Subscription Authority

A Subscription Authority is a PDA that the program uses as the SPL Token delegate for one user's token account and one token mint. Create it before creating fixed delegations, recurring delegations, or subscription plan subscriptions for that mint.

The user's token account must already exist. Initialization creates the Subscription Authority PDA and approves it as the token delegate on the user's token account.

Create The Authority

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();
}

Notes

The user signs the initialization transaction.
Create one Subscription Authority per user and token mint pair.
Reuse the existing Subscription Authority for later delegations on the same mint.
Close the Subscription Authority only after every delegation that depends on it has been revoked or closed.

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