We recently have improved our portal to make the HMAC key generation more straightforward and secure for customers.
You can generate the HMAC keys on your own using FieldClimate.
This is how the procedure works now:
1) Login to https://ng.fieldclimate.com with your FieldClimate user
2) Got to User menu > API services
3) Click GENERATE NEW to get new keys or copy the exist ones if they are already generated