Dynamically Create BitCoin Wallets & Payment Pages on Coinbase in Ruby

fundraiser_controller(1).rb

class FundraiserController < ApplicationController

 ...

 JSON_CREATE_PAYMENT_PAGE = '{ "button": {
                                          "name": "Donation",
                                          "price_string": "1.00",
                                          "price_currency_iso": "EUR",
                                          "type": "donation",
                                          "style": "donation_small",
                                          "variable_price": "true",
                                          "choose_price": "true" 
                                         }
                             }' 

 COINBASE_API_KEY = '...'
 COINBASE_CLIENT_SECRET = '...'
 
 # called when the user creates a fundraiser
 def create
  
    #create Coinbase wallet for fundraiser 
    coinbase = Coinbase::Client.new(COINBASE_API_KEY)
    coinbase_user = coinbase.create_user(params[:email_address], params[:password], COINBASE_CLIENT_SECRET)
    
    #create payment page for created wallet
    oauth_access_token = coinbase_user.oauth.access_token
    oauth_client = OAuth2::Client.new(COINBASE_API_KEY, COINBASE_CLIENT_SECRET)
    oauth_token = OAuth2::AccessToken.new(oauth_client, oauth_access_token)
    coinbase_page = oauth_token.post('https://coinbase.com/api/v1/buttons', {:body => JSON_CREATE_PAYMENT_PAGE, 
                                                                             :headers => {'Content-Type' => 'application/json'}})

    #get payment page code and persist it
    coinbase_page_code = JSON.parse(coinbase_page.body)['button']['code']
    fundraiser = ActionController::Parameters.new(title: params[:title], 
                                              description: params[:description], 
                                              coinbase_page_code: coinbase_page_code)
    Fundraiser.create!(fundraiser.permit!)

    flash[:success] = 'Created fundraiser!'

  rescue Coinbase::Client::Error => e

    flash[:error] = e.message
    
  ensure

    redirect_to root_path

  end
  
  ...
  
end  

fundraiser_controller(2).rb

class FundraiserController < ApplicationController

 ...

 def show
    @fundraiser = Fundraiser.find_by_id(params[:id])
 end

 ...
 
end

Gemfile

...
# remember to use the forked version of coinbase-ruby: https://github.com/claudemamo/coinbase-ruby
gem "coinbase", "~> 1.3.0"

gem "oauth2", "~> 0.9.3"

show.html.erb

<div>
  ...
  <a class="coinbase-button" data-code="<%= @fundraiser.coinbase_page_code %>" data-button-style="donation_large" href="https://coinbase.com/checkouts/<%= @fundraiser.coinbase_page_code %>">Donate Bitcoins</a>
  <script src="https://coinbase.com/assets/button.js" type="text/javascript"></script>
  ...
</div>