RE: Import payable manual payments into Dynamics GP 2015 using Integration Manager
Integration Manager doesn't have a destination for manual payments.
One thing you could do if you really want to get historical data in there with the payments applied is when you import the invoices, you can pay them off at the same time.
This will create the payment record and pay off the invoice at the same time. The only issue you'd have is applying one payment to multiple records. If the check number was 1000 for example, you could do 1000-1, 1000-2, 1000-3, 1000-4, etc against each of the single invoices when you import them. Or even set the checkbook to allow duplicate check numbers but you'd have multiple payments with the same number then.
Importing historical payments is always a tricky subject due to the applying part.