THIS IS NOT ABOUT A WALLET IN SPECIFIC ! This is a general guideline for developing a spending wallet, by Bitcoin Design team. Is not about some app in specific. Based on these guidelines, BD team is talking with developing teams and help them with a good design. They did it with many wallet apps and all their talking sessions are public on BitcoinTV:

Bitcoin Design team is doing great guides, like this one for example, about LN liquidity: https://bitcoin.design/guide/how-it-works/liquidity/