Packet logger data format

what’s the encoding format of the “data” field in the packet logger and what does it exactly contain ?
I’m assuming is BASE64
“data”: “QAEAAAIApxhWjv+oFFb2zXRb0zKP”

It is Base64 and it contains data that is encrypted.

You can decrypt it if you have access to the devices keys and then read the LoRaWAN spec to figure out all the different parts. Many have tried, the glory of success could be yours.