This results in code that is easier to read, and better indicates
the code is dealing with an object and not a hash.
Rename ser to data in some Invoice methods to keep it consistent.
Allow Invoice#generate_pdf argument to be optional, and use the
invoice serializer if the argument is not given.
Remove unnecessary detailed: true options when calling the invoice
serializer.
Avoid creating an unnecessary invoice serializer in the invoice
route.
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