Well you haven't addressed the issue of backing up the wallet or addresses in case your site goes offline. What would the users do in case such an event happened?
I wouldn't want to be like the victims of the Rahakott wallet closure.
People weren't able to retrieve their funds when they shut down their business because the "mnemonic phrases" weren't actually working in any other known wallet.
When we developed Nummix we did not want to create just another wallet.
- Nummix is a transit wallet with a dynamically adjusted service fee (the wallet is not intended for long-term storage)
- its primary features are a mixer and accepting payments via the API
- the domains are paid for 7 years and we do not plan to close the service, the funds are already allocated for that time
If you are not interested in a transit wallet with a mixer, there are other options on the market