Update app to include service for AvaTax api.

app/models/tax_rate.rb

@@ -0,0 +1,10 @@
+class TaxRate
+  def self.get_tax_rate
+    response = RestClient::Request.execute(
+      method: :get,
+      url: 'https://sandbox-rest.avatax.com/api/v2/taxrates/bypostalcode?country=US&postalCode=98105',
+      headers: { Authorization: ENV['AVATAX_KEY'] }
+    )
+    return JSON.parse(response)['totalRate']
+  end
+end

spec/rails_helper.rb

@@ -71,4 +71,5 @@
   c.filter_sensitive_data('<publishable_key>') { ENV['PUBLISHABLE_KEY'] }
   c.filter_sensitive_data('<secret_key>') { ENV['SECRET_KEY'] }
   c.filter_sensitive_data('<currencylayer_key>') { ENV['CURRENCYLAYERKEY'] }
+  c.filter_sensitive_data('<avatax_key>') { ENV['AVATAX_KEY'] }
 end