Build Paystack Subscriptions in Ruby on Rails

rails generate model Subscription user:references subscription_code:string:uniq plan_code:string email_token:string status:string next_payment_date:datetime
rails db:migrate

def subscribe
  service = PaystackService.new
  result = service.initialize_with_plan(
    email: current_user.email,
    plan_code: params[:plan_code],
    callback_url: subscription_callback_url
  )

  if result['status']
    redirect_to result['data']['authorization_url'], allow_other_host: true
  else
    flash[:error] = result['message']
    redirect_to pricing_path
  end
end

def handle_subscription_create(data)
  user = User.find_by(email: data['customer']['email'])
  return unless user

  Subscription.find_or_initialize_by(user: user).update!(
    subscription_code: data['subscription_code'],
    plan_code: data['plan']['plan_code'],
    email_token: data['email_token'] || '',
    status: 'active',
    next_payment_date: data['next_payment_date']
  )
end

def handle_invoice_failed(data)
  sub_code = data.dig('subscription', 'subscription_code')
  Subscription.where(subscription_code: sub_code).update_all(status: 'past_due') if sub_code
end

# app/controllers/concerns/subscription_required.rb
module SubscriptionRequired
  extend ActiveSupport::Concern

  included do
    before_action :require_active_subscription
  end

  private

  def require_active_subscription
    unless current_user&.subscription&.status == 'active'
      redirect_to pricing_path, alert: 'An active subscription is required.'
    end
  end
end

# In premium controllers:
class PremiumController < ApplicationController
  include SubscriptionRequired
end

def cancel
  sub = current_user.subscription
  return redirect_to dashboard_path, alert: 'No subscription' unless sub

  service = PaystackService.new
  result = service.disable_subscription(sub.subscription_code, sub.email_token)

  if result['status']
    sub.update!(status: 'cancelled')
    redirect_to dashboard_path, notice: 'Subscription cancelled'
  else
    redirect_to dashboard_path, alert: 'Cancellation failed'
  end
end

This guide is part of the Paystack integration guides by language and framework series.

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