Bip39 Passphrase. It’s a reminder from the essential value of securely storing your seed phrase along with your passphrase. I have read by the material I could try to find but none is offering me an answer I need to finish my programming job of making a wallet. Here is https://thekiwisocial.com/story4643809/bip39-wallet-https-linktr-ee-bip39-a-review-of-bip39-generator