Bip39 checksum calculator https://www.symbaloo.com/mix/bookmarks-xfkm The buy with the mnemonic phrase matters. In case you mess up the purchase then You can't Recuperate your wallet. All of your resources will probably be misplaced permanently. Make sure you have a suitable backup. Some wallets can import various seed phrases plus some have https://dzen.ru/bip39-phrase.com