Spreedly is a cloud-based credit card vault that allows users to work with multiple payment gateways simultaneously.

Payment Gateway?

Payment Processor?

Payment Aggregator?

Billing-Subscription Solution? 

Subscription-Billing Solution for Pinterest's service

Payments IQ Bootcamp

Each of the services really has a different flavor and best fit, and I'd encourage you to try them out to see which is best for you. FWIW, Spreedly no longer offers an all-in-one recurring billing system; it was sold to Pin Payments. My main recommendation to all startups is: do not build your own billing system! While you might need to build one down the road, you can get really far leveraging one of the pre-built solutions and spend your time on much more important things early in your business' life.

With that context, one critical thing I would recommend assessing the various services on is the amount of lock-in they engender: how hard will it be to bring things in-house or switch to a different service if your needs change down the road? What about if you want to keep using the service but need to switch payment gateways? Some businesses will use the same billing setup for their whole lifetime, but most will switch at least once, so be careful about painting yourself too tightly in to a corner.

gem 'spreedly'

env = Spreedly::Environment.new(environment_key, access_secret)

transaction = env.purchase_on_gateway(gateway_token, payment_method_token, 4432)

transaction.succeeded?    # => true
transaction.token         # => "aGJlY5srn7TFeYKxO5pmwi3CyJd"

A Gateway

gateway = env.add_gateway(:test)
gateway.token     # => "DnbEJaaY2egcVkCvg3s8qT38xgt"



####################################
# Grab info for supported gateways
###################################

env.gateway_options

A Payment Information aka payment method

Action payment method

env.verify_on_gateway(gateway_token, payment_method_token, retain_on_success: true)

auth_transaction = env.authorize_on_gateway(gateway_token, payment_method_token, 250)

if auth_transaction.succeeded?
  capture_transaction = env.capture_transaction(auth_transaction.token)
end

capture_transaction = env.capture_transaction(auth_transaction.token, amount: 100)

env.purchase_on_gateway(gateway_token, payment_method_token, amount,
                        order_id: "123",
                        description: "The Description",
                        ip: "192.31.123.112",
                        merchant_name_descriptor: "SuperDuper Corp",
                        merchant_location_descriptor: "http://super.com",
                        currency_code: "GBP",
                        retain_on_success: true)