deleteCredentialsSmartLock.kt

val credential = Credential.Builder(login)
                           .setName(login)
                           .setPassword(password)
                           .build()

RxGoogleSmartLockManager.deleteStoredCredentials(context, credential)
                        .subscribe({
                           Toast.makeText(this, "Deleted credential successfully", Toast.LENGTH_SHORT).show()
                        }, {
                           Toast.makeText(this, "Failed deleting credential: $it", Toast.LENGTH_SHORT).show() 
                        })