Idea 1. Would be neat to have the ability to record a partial payment of an invoice and record the outstanding amount against the invoice. The invoice would still list in Unpaid but show the total paid and outstanding balance as well.
Idea 2. When collecting payment of an invoice via GoCardless it is tricky to record the fees associated with the payments. We have a growing band of customers who pay via monthly direct debit via GoCardless ask then we receive the total of those transactions, less the fees. We either invoice for less than the real invoice of have to create a charge against the fee. Similar to getting paid via PayPal in that you are collecting less then the full amount.