Communicate with TaxJar API

This allows us to calculate the tax for a Solidus order using the TaxJar
API. It's currently hardcoded to use the sandbox, and provides no
caching.

2 files changed, 50 insertions, 0 deletions

diff --git a/lib/super_good/solidus_taxjar.rb b/lib/super_good/solidus_taxjar.rb
index 6553213..40df3ec 100644
--- a/lib/super_good/solidus_taxjar.rb
+++ b/lib/super_good/solidus_taxjar.rb
@@ -8,4 +8,5 @@ module SuperGood
 end
 
 require "super_good/solidus_taxjar/version"
+require "super_good/solidus_taxjar/api"
 require "super_good/solidus_taxjar/tax_calculator"
diff --git a/lib/super_good/solidus_taxjar/api.rb b/lib/super_good/solidus_taxjar/api.rb
new file mode 100644
index 0000000..5434aab
--- /dev/null
+++ b/lib/super_good/solidus_taxjar/api.rb
@@ -0,0 +1,49 @@
+module SuperGood
+  module SolidusTaxJar
+    class API
+      def self.default_taxjar_client
+        ::Taxjar::Client.new(
+          api_key: ENV.fetch("TAXJAR_API_KEY"),
+          api_url: 'https://api.sandbox.taxjar.com'
+        )
+      end
+
+      def initialize(taxjar_client: Client.default_taxjar_client)
+        @taxjar_client = taxjar_client
+      end
+
+      def order_tax_for(order)
+        taxjar_client.tax_for_order order_params(order)
+      end
+
+      private
+
+      attr_reader :taxjar_client
+
+      def order_params(order)
+        ship_address = order.ship_address
+
+        {
+          to_country: ship_address.country.iso,
+          to_zip: ship_address.zipcode,
+          to_city: ship_address.city,
+          to_state: ship_address&.state&.abbr || ship_address.state_name,
+          to_street: ship_address.address1,
+
+          amount: order.item_total,
+          shipping: order.shipment_total,
+
+          line_items: order.line_items.map do |line_item|
+            {
+              id: line_item.id,
+              quantity: line_item.quantity,
+              unit_price: line_item.price,
+              discount: -line_item.adjustment_total,
+              product_tax_code: line_item.tax_category&.tax_code
+            }
+          end
+        }
+      end
+    end
+  end
+end