The CData Cmdlets PowerShell Module for PayPal supports standard SQL joins like the following examples.

Inner Join

An inner join selects only rows from both tables that match the join condition:

SELECT SaleDetails.TotalAmount, Payments.State FROM Payments INNER JOIN SaleDetails ON SaleDetails.ParentPayment = Payments.Id

Left Join

A left join selects all rows in the FROM table and only matching rows in the JOIN table:

SELECT SaleDetails.TotalAmount, Payments.State FROM Payments LEFT JOIN SaleDetails ON SaleDetails.ParentPayment = Payments.Id