Pay

Pay is a Rails engine that puts subscription billing into your models.

What you get

• pay_customer on any model
• Subscriptions, trials, plan swaps, proration and cancellation
• Webhook handling for each processor
• Invoice and receipt records in your database

Adding it

# Gemfile
gem "pay"

# app/models/user.rb
class User < ApplicationRecord
  pay_customer
end

user.payment_processor.subscribe(plan: "price_monthly")
user.payment_processor.subscribed?

The data-locality argument

When subscription state lives in your database, "show enterprise customers this
feature" is a scope. When it lives in a billing vendor, it is an integration.