Simple Accounts and Currencies
Whilst full blown accounting systems are available, requiring a massive integration effort, some applications simply need to be able keep some form of internal account.
The library is the direct descendant of something I wrote for a client many years ago to keep account of game points earned on a web site. Using the double entry accounting paradigm allowed the site owner to keep track of who had gathered points, and in which ways, whilst at the same time seeing what this meant to their business as game points translated into real world value for the customer by way of discounts and prizes.
To support it, there is also a Currency library providing a strong type implementation of an ISO-4217 Current Currency.
You can find the libraries on Packagist as normal