# Stripe Ruby Library

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The Stripe Ruby library provides convenient access to the Stripe API from
applications written in the Ruby language. It includes a pre-defined set of
classes for API resources that initialize themselves dynamically from API
responses which makes it compatible with a wide range of versions of the Stripe
API.

The library also provides other features. For example:

- Easy configuration path for fast setup and use.
- Helpers for pagination.
- Built-in mechanisms for the serialization of parameters according to the
  expectations of Stripe's API.

## Documentation

See the [Ruby API docs](https://stripe.com/docs/api?lang=ruby).

See [video demonstrations][youtube-playlist] covering how to use the library.


## Installation

You don't need this source code unless you want to modify the gem. If you just
want to use the package, just run:

```sh
gem install stripe
```

If you want to build the gem from source:

```sh
gem build stripe.gemspec
```

### Requirements

- Ruby 2.3+.

### Bundler

If you are installing via bundler, you should be sure to use the https rubygems
source in your Gemfile, as any gems fetched over http could potentially be
compromised in transit and alter the code of gems fetched securely over https:

```ruby
source 'https://rubygems.org'

gem 'rails'
gem 'stripe'
```

## Usage

The library needs to be configured with your account's secret key which is
available in your [Stripe Dashboard][api-keys]. Set `Stripe.api_key` to its
value:

```ruby
require 'stripe'
Stripe.api_key = 'sk_test_...'

# list customers
Stripe::Customer.list()

# retrieve single customer
Stripe::Customer.retrieve('cus_123456789')
```

### Per-request Configuration

For apps that need to use multiple keys during the lifetime of a process, like
one that uses [Stripe Connect][connect], it's also possible to set a
per-request key and/or account:

```ruby
require "stripe"

Stripe::Customer.list(
  {},
  {
    api_key: 'sk_test_...',
    stripe_account: 'acct_...',
    stripe_version: '2018-02-28',
  }
)

Stripe::Customer.retrieve(
  'cus_123456789',
  {
    api_key: 'sk_test_...',
    stripe_account: 'acct_...',
    stripe_version: '2018-02-28',
  }
)

Stripe::Customer.retrieve(
  {
    id: 'cus_123456789',
    expand: %w(balance_transaction)
  },
  {
    stripe_version: '2018-02-28',
    api_key: 'sk_test_...',
  }
)

Stripe::Customer.capture(
  'cus_123456789',
  {},
  {
    stripe_version: '2018-02-28',
    api_key: 'sk_test_...',
  }
)
```

Keep in mind that there are different method signatures depending on the action:

- When operating on a collection (e.g. `.list`, `.create`) the method signature is
  `method(params, opts)`.
- When operating on resource (e.g. `.capture`, `.update`) the method signature is
  `method(id, params, opts)`.
- One exception is that `retrieve`, despite being an operation on a resource, has the signature
  `retrieve(id, opts)`. In addition, it will accept a Hash for the `id` param but will extract the
  `id` key out and use the others as options.

### Accessing a response object

Get access to response objects by initializing a client and using its `request`
method:

```ruby
client = Stripe::StripeClient.new
customer, resp = client.request do
  Stripe::Customer.retrieve('cus_123456789',)
end
puts resp.request_id
```

### Configuring a proxy

A proxy can be configured with `Stripe.proxy`:

```ruby
Stripe.proxy = 'https://user:pass@example.com:1234'
```

### Configuring an API Version

By default, the library will use the API version pinned to the account making
a request. This can be overridden with this global option:

```ruby
Stripe.api_version = '2018-02-28'
```

See [versioning in the API reference][versioning] for more information.

### Configuring CA Bundles

By default, the library will use its own internal bundle of known CA
certificates, but it's possible to configure your own:

```ruby
Stripe.ca_bundle_path = 'path/to/ca/bundle'
```

### Configuring Automatic Retries

You can enable automatic retries on requests that fail due to a transient
problem by configuring the maximum number of retries:

```ruby
Stripe.max_network_retries = 2
```

Various errors can trigger a retry, like a connection error or a timeout, and
also certain API responses like HTTP status `409 Conflict`.

[Idempotency keys][idempotency-keys] are added to requests to guarantee that
retries are safe.

### Configuring Timeouts

Open, read and write timeouts are configurable:

```ruby
Stripe.open_timeout = 30 # in seconds
Stripe.read_timeout = 80
Stripe.write_timeout = 30 # only supported on Ruby 2.6+
```

Please take care to set conservative read timeouts. Some API requests can take
some time, and a short timeout increases the likelihood of a problem within our
servers.

### Logging

The library can be configured to emit logging that will give you better insight
into what it's doing. The `info` logging level is usually most appropriate for
production use, but `debug` is also available for more verbosity.

There are a few options for enabling it:

1. Set the environment variable `STRIPE_LOG` to the value `debug` or `info`:

   ```sh
   $ export STRIPE_LOG=info
   ```

2. Set `Stripe.log_level`:

   ```ruby
   Stripe.log_level = Stripe::LEVEL_INFO
   ```

### Instrumentation

The library has various hooks that user code can tie into by passing a block to
`Stripe::Instrumentation.subscribe` to be notified about specific events.

#### `request_begin`

Invoked when an HTTP request starts. Receives `RequestBeginEvent` with the
following properties:

- `method`: HTTP method. (`Symbol`)
- `path`: Request path. (`String`)
- `user_data`: A hash on which users can set arbitrary data, and which will be
  passed through to `request_end` invocations. This could be used, for example,
  to assign unique IDs to each request, and it'd work even if many requests are
  running in parallel. All subscribers share the same object for any particular
  request, so they must be careful to use unique keys that will not conflict
  with other subscribers. (`Hash`)

#### `request_end`

Invoked when an HTTP request finishes, regardless of whether it terminated with
a success or error. Receives `RequestEndEvent` with the following properties:

- `duration`: Request duration in seconds. (`Float`)
- `http_status`: HTTP response code (`Integer`) if available, or `nil` in case
  of a lower level network error.
- `method`: HTTP method. (`Symbol`)
- `num_retries`: The number of retries. (`Integer`)
- `path`: Request path. (`String`)
- `user_data`: A hash on which users may have set arbitrary data in
  `request_begin`. See above for more information. (`Hash`)
- `request_id`. HTTP request identifier.

#### Example

For example:

```ruby
Stripe::Instrumentation.subscribe(:request_end) do |request_event|
  tags = {
    method: request_event.method,
    resource: request_event.path.split('/')[2],
    code: request_event.http_status,
    retries: request_event.num_retries
  }
  StatsD.distribution('stripe_request', request_event.duration, tags: tags)
end
```

### Writing a Plugin

If you're writing a plugin that uses the library, we'd appreciate it if you
identified using `#set_app_info`:

```ruby
Stripe.set_app_info('MyAwesomePlugin', version: '1.2.34', url: 'https://myawesomeplugin.info')
```

This information is passed along when the library makes calls to the Stripe
API.

### Request latency telemetry

By default, the library sends request latency telemetry to Stripe. These
numbers help Stripe improve the overall latency of its API for all users.

You can disable this behavior if you prefer:

```ruby
Stripe.enable_telemetry = false
```

## Development

The test suite depends on [stripe-mock], so make sure to fetch and run it from a
background terminal ([stripe-mock's README][stripe-mock] also contains
instructions for installing via Homebrew and other methods):

```sh
go get -u github.com/stripe/stripe-mock
stripe-mock
```

Run all tests:

```sh
bundle exec rake test
```

Run a single test suite:

```sh
bundle exec ruby -Ilib/ test/stripe/util_test.rb
```

Run a single test:

```sh
bundle exec ruby -Ilib/ test/stripe/util_test.rb -n /should.convert.names.to.symbols/
```

Run the linter:

```sh
bundle exec rake rubocop
```

Update bundled CA certificates from the [Mozilla cURL release][curl]:

```sh
bundle exec rake update_certs
```

Update the bundled [stripe-mock] by editing the version number found in
`.travis.yml`.

[api-keys]: https://dashboard.stripe.com/account/apikeys
[connect]: https://stripe.com/connect
[curl]: http://curl.haxx.se/docs/caextract.html
[idempotency-keys]: https://stripe.com/docs/api/idempotent_requests?lang=ruby
[stripe-mock]: https://github.com/stripe/stripe-mock
[versioning]: https://stripe.com/docs/api/versioning?lang=ruby
[youtube-playlist]: https://www.youtube.com/playlist?list=PLy1nL-pvL2M50RmP6ie-gdcSnfOuQCRYk

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