I tried to work with 3rd part systems but I've quit that idea. I was in middle of syncing todo list with google todo but then came across one problem where I could not found anything on any forum.. any documentation, nowhere.

Also payments goal were using Paypal at beginning - but this came out to be very problematic as Paypal does not support Pools in API co I used curl for data fetch and... when You call page in short time like 2-3 times Your Ip gets banned for few min....

I decided on that moment that I want to have independent system.