How to create Trial Balance records in Appian and use web API to access the Trial Balance data

I'd suggest starting with this tutorial in the documentation: https://docs.appian.com/suite/help/latest/Service-Backed_Record_Tutorial.html

It describes how to create an integration that can call an API and then create a record type against that integration. If you have any issues when doing this, please feel free to post any questions / error messages here! Keep in mind that the more information you can provide us about what you're trying to do, the easier it will be for us to help you!