Filly is a micro gem used to add, update and save credit cards on Stripe servers. To experiment with that code, run bin/console for an interactive prompt.

Our Sponsor

This project is sponsored by Zepho Inc. If you are interested in learning TDD in Ruby, you can redeem the coupon here:


  1. Create a new credit card for a customer (creating credit card for the first time)
  2. Add a new credit card as the default credit card
  3. Update credit card expiration date
  4. Stripe credentials checker


Ruby : 2.3.0 Stripe Gem : 1.25


Add this line to your application's Gemfile:

gem 'filly'

And then execute:

$ bundle

Or install it yourself as:

$ gem install filly


Refer the StripeGateway class in the sample Rails app:


After checking out the repo, run bin/setup to install dependencies. Then, run rake test to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and tags, and push the .gem file to

$ruby -rminitest/pride test/credential_test.rb --verbose
$ruby -rminitest/pride test/credit_card_test.rb --verbose

or run rake:


to run all the tests.


Bug reports and pull requests are welcome on GitHub at


The gem is available as open source under the terms of the MIT License.