Update refund API call to take into account line items

[Noah-Silvera]

Our usage of the "create refund" API endpoint does not pass individual line items, just totals.

solidus_taxjar/lib/super_good/solidus_taxjar/api_params.rb

Line 54 in f64364a

def refund_params(reimbursement)

Different product types can be taxed different amounts under different tax codes, so it's important to ensure that we know which item(s) the refund was issued for.

[Noah-Silvera]

This is still technically a problem, but a new refund_transaction_params method was created which takes into account line items, and this old refund endpoint will likely be deprecated. We should fix this if someone requests it, but it's not high priority