// Package abono is rastrillo's payments addon: Stripe subscriptions
// for an app, and the memberships they grant. One-off payments are not
// covered.
//
// Two rulings bind everything here, both from rastrillo's addons
// doctrine. The arrow points one way: abono depends on rastrillo,
// rastrillo never learns abono exists. The app owns policy: abono
// records what Stripe says and what an operator grants, and the app
// decides what a plan lets a person do.
package abono