Yup, this makes sense for e2e. You can have your billing service billing in the test currency for e2e (and probably with a value that does not match the USD) s

Yup, this makes sense for e2e. You can have your billing service billing in the test currency for e2e (and probably with a value that does not match the USD) so you can test "ok this should cost 1 credit so in the end I should have 18 $currency"