There are really three subsystems: invoices, forwards and sendpays,
each of which has two variants we care about (successes and failures).
If we split the code that way, we can extract the core differences in
each of these cases and share most of the logic.
It's a bit awkward to iterate over each "subsystem" in the JSON
parameter sense, so we have some iteration code to do that where we
need to.
The result is going to be much easier to paginate!
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
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