Is it possible to use your services also with other wallets or is your software built in-wallet? It could be interesting to enable the integration with other reliable wallet services also.
i dont think it will support purchase from other wallets as the team is developing it's own wallet.
Yes, but why not make it so that the user can choose what to use and not be forced to use their wallet?
Because than you have limited functionalities like you will not be able to trade erc20 tokens to nonerc 20 and vice versa.