I have very little experience with BLE, and none with audio. I said what I said on the assumption that you need one and have the wherewithall to give it. IF you need to configure a password, the commands for HM-10 are AT+PASS? to query but may be AT+PIN to assign. If there is no command in the datasheet, there may be no password required.
With HM-10, there is no pairing per se, even if the phone can see it, and the connection is made in the app. No password is required to do that, even though there is provision for password in the HM-10 command set.