What table are payments in?

I found invoices in AP_InvoiceHeader that move to AP_InvoiceHistoryHeader table after the invoice posted, but I cannot find any documentation on where to find payments.

I created a Visual Integrator job that imports our credit card transactions as invoices and I want to also import payments, but can't seem to find documentation on the table structure.

I found the File Layouts and Program Information under Sage 100 resources, but it is next to useless to explain table structure.

I've dumped every table in the AP module into Access with an ODBC connector and can't seem to find the company's payments.

Can anyone shed any light on where transaction type Payments are housed?