E-Keys are a way to allow your family and close friends to enter your home through their own Array app.
To ensure the E-Key is setup correctly, the person will need to have the Array app downloaded, have their own Array account and have access to the Array Lock keypad so they can enter the tethering code.
E-Codes are best for a one time code or a code on a set schedule. This will eliminate the need to unlock the Array from a smart device or the Array app. The owner of the Array lock would assign E-Codes and provide the E-Code to the person in need of access.
Assigning E-Codes would be best for deliveries or for someone that would need to have temporary access.