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Showing content from https://github.com/akowalz/omniauth-braintree-auth below:

akowalz/omniauth-braintree-auth: OmniAuth Strategy for Braintree Auth

An OmniAuth strategy for Braintree Auth.

Braintree Auth is currently in closed beta, use the link above to request access.

Add it to your application's Gemfile:

gem 'omniauth-braintree-auth'

And then run:

It's helpful to have a general understanding of how OmniAuth works and what it provides before diving into a particular strategy. I recommend checking out the OmniAuth documentation for more information on how to use OmniAuth strategies.

The Braintree Auth strategy allows you pass a client_id, client_secret, redirect_uri, scope, environment, and landing_page as configuration options. Example usage in a Rack application:

use OmniAuth::Builder do
  provider :braintree_auth,
    "your_client_id", "your_client_secret",
    :scope => "read_write",                                                # required
    :redirect_uri => "http://localhost:4567/auth/braintree_auth/callback", # required
    :landing_page => "login",                                              # optional, one of 'signup' or 'login'
    :environment => "production"                                           # optional, defaults to sandbox
end

or, in Rails:

# app/initializers/omniauth.rb

Rails.application.config.middleware.use OmniAuth::Builder do
  provider :braintree_auth,
    "your_client_id", "your_client_secret",
    :scope => "read_write",                                                # required
    :redirect_uri => "http://localhost:4567/auth/braintree_auth/callback", # required
    :landing_page => "login",                                              # optional, one of 'signup' or 'login'
    :environment => "production"                                           # optional, defaults to sandbox
end

The Braintree Auth strategy makes requests against Braintree's sandbox environment by default, which is useful for testing your integration. When you are ready to go live, be sure to specify environment => "production" when building your strategy.

To send your users to Braintree, simply point them to /auth/braintree_auth in your application. It's best practice to have your users click the "Connect with Braintree" button provided by Braintree to kick off this redirect.

<a href="/auth/braintree_auth">
  <img src="https://s3-us-west-1.amazonaws.com/bt-partner-assets/connect-braintree.png" alt="Connect with Braintree" width="328" height="44">
</a>

After signing up with Braintree or authorizing access to an existing account, the user will be sent back to your site to the redirect URI you provided. For OmniAuth, this must be at the path /auth/braintree_auth/callback. Be sure that this URI is whitelisted under your OAuth Application configuration in the Braintree Control Panel (Settings > OAuth Applications).

Once redirected, the Braintree merchant ID, access token, and refresh token will be available in request.env['omniauth.auth']

Here is an example auth hash provided in request.env['omniauth.auth']:

{
  uid: "braintree_merchant_id",
  info: { merchant_id: "braintree_merchant_id" },
  credentials: {
    access_token: "access_token$sandbox$example_access_token",
    refresh_token: "access_token$sandbox$example_refresh_token",
    expires_at: "2026-06-14 19:49:02 UTC"
  }
}

you can then use this information in your application:

get '/auth/braintree_auth/callback' do
  auth_hash = request.env['omniauth.auth']

  access_token = auth_hash['credentials']['access_token']
end

For more information about how to use a Braintree access token on behalf of a merchant, see the Merchant API section of the Braintree Auth developer docs.

Here is a full example Sinatra application using omniauth-braintree-auth. It simply displays the user's access token after they are redirected.

require 'sinatra/base'
require 'omniauth-braintree-auth'

class TestApp < Sinatra::Base
  enable :method_override
  enable :sessions

  use Rack::Session::Cookie

  use OmniAuth::Builder do
    provider :braintree_auth,
      ENV['BRAINTREE_AUTH_CLIENT_ID'], ENV['BRAINTREE_AUTH_CLIENT_SECRET'],
      :scope => "read_write",
      :redirect_uri => "http://127.0.0.1:4567/auth/braintree_auth/callback",
      :landing_page => "login",
      :environment => "sandbox",
  end

  get '/' do                                                                                                                                     
    '<a href="/auth/braintree_auth">                                                                                                             
      <img src="https://s3-us-west-1.amazonaws.com/bt-partner-assets/connect-braintree.png" alt="Connect with Braintree" width="328" height="44">
    </a>'                                                                                                                                        
  end                                                                                                                                            
                                                                                                                                                
  get '/auth/braintree_auth/callback' do                                                                                                         
    auth_hash = request.env['omniauth.auth']                                                                                                     
    merchant_id = auth_hash['uid']                                                                                                               
    access_token = auth_hash['credentials']['access_token']                                                                                      

    "#{access_token} can be used to access merchant #{merchant_id}"                                                                              
  end                                                                                                                                            
end

TestApp.run!

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