wallet.paymentid.email 
or thanks .
Nanopool have clear instructions for that, wallet string is constant among all miners. In your case it'll wallet.worker/email, for example or thanks .Code:
...
/* Mining pool address WITHOUT the stratum+tcp:// or stratum+tls:// part */
"pool" : "xmr-eu1.nanopool.org:14433",
/* Address of you wallet */
"wallet" : "48edfHu7V9Z84YzzMa6fUueoELZ9ZRXq9VetWzYGzKt52XU5xvqgzYnDK9URnRoJMk1j8nLwEVsaSWJ4fhdUyZijBGUicoD.rig1/user@mail.com",
...
You need payment-id only if you mining directly to exchange, in that case just add it (payment-id) between address and worker name, eg wallet.payment-id.worker/email/* Mining pool address WITHOUT the stratum+tcp:// or stratum+tls:// part */
"pool" : "xmr-eu1.nanopool.org:14433",
/* Address of you wallet */
"wallet" : "48edfHu7V9Z84YzzMa6fUueoELZ9ZRXq9VetWzYGzKt52XU5xvqgzYnDK9URnRoJMk1j8nLwEVsaSWJ4fhdUyZijBGUicoD.rig1/user@mail.com",
...