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If you already have a wallet (Phantom, Solflare, Metamask, etc.):
  1. Export your private key from your wallet application
    Note this is NOT your seed phrase. Expect [152,130,...,90,144].
  2. Convert it to the keypair JSON format required by the payment libraries
  3. Save it as client-wallet.json
Never share your private key or keypair file. Anyone with access can control your funds.