Multi-master DNP3 Implementation

[Hardik Sanghavi]

Hello,
I work for an IoT company that integrates data from a lot of sensors in field using a variety of communication protocols like GSM, Ethernet, WiFi, LoRa etc

Some of our customers need access to data through DNP3.

So I am thinking of implementing an OutStation machine that can provide the right data to the right customers.

For example, Customer A should only have access to Data from Device A and Customer B should only have access to Data from Device B and so on.

What is the right approach towards setting this up ?
Should I have individual outstation implementation per customer or there is some mechanism that understands who the customer is and provides only relevant access ?

How do I accomplish User Authentication ?

Thanks in advance.