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Installing Pay

Pay's installation is pretty straightforward. We'll add the gems, add some migrations, and update our models.

Gemfile

Add these lines to your application's Gemfile:

gem "pay", "~> 8.0"

# To use Stripe, also include:
gem "stripe", "~> 13.0"

# To use Braintree + PayPal, also include:
gem "braintree", "~> 4.7"

# To use Paddle Billing or Paddle Classic, also include:
gem "paddle", "~> 2.5"

# To use Lemon Squeezy, also include:
gem "lemonsqueezy", "~> 1.0"

# To use Receipts gem for creating invoice and receipt PDFs, also include:
gem "receipts", "~> 2.0"

And then execute:

bundle

Migrations

Copy the Pay migrations to your app:

bin/rails pay:install:migrations

Then run the migrations:

bin/rails db:migrate

Make sure you've configured your ActionMailer default_url_options so Pay can generate links (for features like Stripe Checkout).

# config/application.rb
config.action_mailer.default_url_options = { host: "example.com" }

Models

To add Pay to a model in your Rails app, simply add pay_customer to the model:

# == Schema Information
#
# Table name: users
#
#  id                     :bigint           not null, primary key
#  email                  :string           default(""), not null

class User < ApplicationRecord
  pay_customer
end

Note: Pay requires your model to have an email attribute. Email is a field that is required by Stripe, Braintree, etc to create a Customer record.

For pay to also send the customer's name to your payment processor, your model should respond to one of the following methods.

  • name
  • first_name and last_name
  • pay_customer_name

Name will not sync automatically. See the section below Syncing attributes.

Customer Attributes

Stripe allows you to send over a hash of attributes to store in the Customer record in addition to email and name. For more information about the different attributes Stripe accepts for a customer visit the Stripe API documentation here.

class User < ApplicationRecord
  pay_customer stripe_attributes: :stripe_attributes
  # Or using a lambda:
  # pay_customer stripe_attributes: ->(pay_customer) { { metadata: { user_id: pay_customer.owner_id } } }

  def stripe_attributes(pay_customer)
    {
      address: {
        city: pay_customer.owner.city,
        country: pay_customer.owner.country
      },
      metadata: {
        pay_customer_id: pay_customer.id,
        user_id: id # or pay_customer.owner_id
      }
    }
  end

Pay will include attributes when creating a Customer and update them when the Customer is updated.

Syncing attributes

By adding pay_customer to your model, the Pay::Billable::SyncCustomer concern will be included. It's responsible for syncing your customer's data from your application to the payment processor in an after_commit callback if the method pay_should_sync_customer? returns true.

By default, pay_should_sync_customer? will respond with saved_change_to_email?, which means Pay will automatically sync your customer with your payment processor when its e-mail changes.

If you want to automatically sync whenever any other attribute changes, override pay_should_sync_customer? in your model. For instance, if you want to sync when your model's name changes, or you are using stripe_attributes above to send Stripe the customer's address, it might be a good idea to also sync when these attributes change:

class User < ApplicationRecord

  def pay_should_sync_customer?
    # super will invoke Pay's default (e-mail changed)
    super || self.saved_change_to_address? || self.saved_change_to_name?
  end

end

ActiveRecord Dirty is your friend here.

Next

See Configuration