PayPal Express Checkout API Client for recurring billing.

gem install paypal-recurring

First, you need to set up your credentials:

require "paypal/recurring"

PayPal::Recurring.configure do |config|
  config.sandbox = true
  config.username = "seller_1308793919_biz_api1.simplesideias.com.br"
  config.password = "1308793931"
  config.signature = "AFcWxV21C7fd0v3bYYYRCpSSRl31AzaB6TzXx5amObyEghjU13.0av2Y"
end

Then, you can request a new payment authorization:

ppr = PayPal::Recurring.new({
  :return_url   => "https://example.com/paypal/thank_you",
  :cancel_url   => "https://example.com/paypal/canceled",
  :ipn_url      => "https://example.com/paypal/ipn",
  :description  => "Awesome - Monthly Subscription",
  :amount       => "9.00",
  :currency     => "USD"
})

response = ppr.checkout
puts response.checkout_url if response.valid?

You need to redirect your user to the url returned by response.checkout_url. After the user accepts or rejects your payment request, he will be redirected to one of those urls you specified. The return url will receive two parameters: PAYERID and TOKEN. You can use the TOKEN parameter to identify your user on your database.

If you need to retrieve information about your buyer, like address or e-mail, you can use the checkout_details() method.

ppr = PayPal::Recurring.new(:token => "EC-05C46042TU8306821")
response = ppr.checkout_details

Now, you need to request payment. The information you provide here should be exactly the same when you started the checkout process.

ppr = PayPal::Recurring.new({
  :token       => "EC-05C46042TU8306821",
  :payer_id    => "WTTS5KC2T46YU",
  :amount      => "9.00",
  :description => "Awesome - Monthly Subscription"
})
response = ppr.request_payment
response.approved?
response.completed?

Finally, you need to create a new recurring profile.

ppr = PayPal::Recurring.new({
  :amount      => "9.00",
  :currency    => "USD",
  :description => "Awesome - Monthly Subscription",
  :ipn_url     => "https://example.com/paypal/ipn",
  :frequency   => 1,
  :token       => "EC-05C46042TU8306821",
  :period      => :monthly,
  :reference   => "1234",
  :payer_id    => "WTTS5KC2T46YU",
  :start_at    => Time.now,
  :failed      => 1,
  :outstanding => :next_billing
})

response = ppr.create_recurring_profile
puts response.profile_id

(Optionally) You can specify a trial period, frequency, and length.

ppr = PayPal::Recurring.new({
  :amount          => "9.00",
  :currency        => "USD",
  :description     => "Awesome - Monthly Subscription",
  :ipn_url         => "https://example.com/paypal/ipn",
  :frequency       => 1,
  :token           => "EC-05C46042TU8306821",
  :period          => :monthly,
  :reference       => "1234",
  :payer_id        => "WTTS5KC2T46YU",
  :start_at        => Time.now,
  :failed          => 1,
  :outstanding     => :next_billing,
  :trial_length    => 1,
  :trial_period    => :monthly,
  :trial_frequency => 1
})

You can manage your recurring profile.

ppr = PayPal::Recurring.new(:profile_id => "I-VCEL6TRG35CU")

ppr.suspend
ppr.reactivate
ppr.cancel

You should save two paramaters to your database: TOKEN and PROFILEID. TOKEN is required when user returns to your website after he authorizes (or not) the billing process. You need to save it so you can find him later. You can remove this info after payment and recurring profile are set.

The PROFILEID allows you to manage the recurring profile, like cancelling billing when an user don’t want to use your service anymore.

NOTE: TOKEN will expire after approximately 3 hours.

• Nando Vieira (nandovieira.com.br)

(The MIT License)

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the ‘Software’), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED ‘AS IS’, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.