Unassigned Balance Tracking

[Wizofgoz]

1. When character makes an overpayment on an invoice, that additional amount should be tracked and used against future invoices automatically.

2. Characters should be able to make payments to an organization using a unique code of theirs to add credit to their relationship with that organization.

3. Characters with the correct permissions should be able to make a payment to an organization (recipient) on behalf of another organization (payer) using a unique code of the payer's to add credit to their relationship with the recipient organization.

Possible implementation for 2 and 3 is to have them let us know they will be making a payment to an organization and a one-time code will be generated for the impending transaction and can be searched for when processing payments.