Add resource for External Payments

examples/payments.rb

@@ -0,0 +1,24 @@
+$: << File.expand_path(File.dirname(__FILE__) + '/../lib')
+
+require "chargify_api_ares"
+
+Chargify.configure do |c|
+  c.subdomain = ENV['CHARGIFY_SUBDOMAIN']
+  c.api_key   = ENV['CHARGIFY_API_KEY']
+end
+
+# Find a Chargify Subscription
+sub = Chargify::Subscription.find_by_customer_reference 'abc-123-def-456'
+
+# Record an external payment on the Chargify Subscription
+pmt = sub.payment(
+  amount_in_cents: 2500,
+  memo: "Pre-payment for..."
+)
+
+# Or, create the external payment directly:
+pmt = Chargify::Payment.create(
+  subscription_id: sub.id,
+  amount_in_cents: 2500,
+  memo: "Pre-payment for..."
+)

lib/chargify_api_ares.rb

@@ -12,6 +12,7 @@
 require 'chargify_api_ares/resources/customer'
 require 'chargify_api_ares/resources/event'
 require 'chargify_api_ares/resources/migration'
+require 'chargify_api_ares/resources/payment'
 require 'chargify_api_ares/resources/payment_profile'
 require 'chargify_api_ares/resources/product'
 require 'chargify_api_ares/resources/product_family'

lib/chargify_api_ares/resources/payment.rb

@@ -0,0 +1,7 @@
+module Chargify
+  class Payment < Base
+    include ResponseHelper
+
+    self.prefix = '/subscriptions/:subscription_id/'
+  end
+end

lib/chargify_api_ares/resources/subscription.rb

@@ -74,6 +74,14 @@ def charge(attrs = {})
       Chargify::Charge.create(attrs.merge(:subscription_id => self.id))
     end
 
+    # Record an external payment on an existing subscription.
+    # This DOES NOT charge the customer's credit card.
+    # For more information, please see the API docs available
+    # at: https://docs.chargify.com/api-payments
+    def payment(attrs = {})
+      Chargify::Payment.create(attrs.merge(:subscription_id => self.id))
+    end
+
     def credit(attrs = {})
       attrs, options = extract_uniqueness_token(attrs)
       process_capturing_errors do