Follow the steps below and you will be able to get a list of all the fees you were charged for the year so you can report them for tax purposes.
Log into plastiq.com/login
Go to Manage payment
Click on the date buttons and select Jan 1 to Dec 31 in the year that you need (Example: Year 2016 - Jan 1, 2016 to Dec 31, 2016)
Click on Export Results as .csv and you are done.
You will now have a report that details all the payments for the year and how much you paid in fees as well.