We are developing wallet on MIJIN and we have a problem to find API where we can IMPORT WALLET with User PrivateKey (there are APIs to get account with address or with public key but not with PrivatKey).
What we need is the same API used by mobile APP wallets NEM when you ADD ACCOUNT
There is no such api call.
On wallet all cryptography should be made on client side for security reasons.
Address can be derived from private key.
What programming language are you using?