Sending BTC using Seed Hex or mnemonic
I’m interested in sending BTC from wallet to another and probably automate it through some libraries.
I have a question: if I have a seed hex or 12 words I can generate all my wallets (addresses, private keys) with BIP39 mnemonic tool.
How could I know what of external wallets (private keys) I should use to send btc using libraries assuming it usually changes?
How could I basically send BTC to some wallet having only seed hex or 12 words?