Greenbox billing

Greenbox charges the card on file at 05:00 on the morning of each delivery day,
after the packing list has been frozen, so the amount charged always matches
what is in the box including any substitutions and credits.

A failed charge pauses the account immediately and the box does not ship. The
card is retried once a day for three days. A subscriber who fixes the card
during those three days has the subscription resumed from the next delivery
day; if all three retries fail, the subscription is suspended and has to be
restarted from the account page.

Account credit is applied before the card is charged, oldest credit first.
Credit from a reported substitution, a referral, or a service failure all sit in
the same balance, and the account page shows where each amount came from.

Invoices are issued per box, not per month, and are available on the order page
within an hour of the charge. A subscriber who needs a monthly summary can
download one from the billing page; it is generated on request rather than
emailed automatically.
