4 files changed, 65 insertions, 3 deletions
diff --git a/lib/super_good/solidus_taxjar/api.rb b/lib/super_good/solidus_taxjar/api.rb
index d52a4a4..301fba4 100644
--- a/lib/super_good/solidus_taxjar/api.rb
+++ b/lib/super_good/solidus_taxjar/api.rb
@@ -20,6 +20,10 @@ module SuperGood
         taxjar_client.rates_for_location(*APIParams.address_params(address))
       end
 
+      def create_transaction_for(order)
+        taxjar_client.create_order APIParams.transaction_params(order)
+      end
+
       private
 
       attr_reader :taxjar_client
diff --git a/lib/super_good/solidus_taxjar/api_params.rb b/lib/super_good/solidus_taxjar/api_params.rb
index 4e61253..f75713c 100644
--- a/lib/super_good/solidus_taxjar/api_params.rb
+++ b/lib/super_good/solidus_taxjar/api_params.rb
@@ -21,6 +21,18 @@ module SuperGood
           ]
         end
 
+        def transaction_params(order)
+          {}
+            .merge(order_address_params(order.tax_address))
+            .merge(
+              transaction_id: order.number,
+              transaction_date: order.completed_at.to_formatted_s(:iso8601),
+              amount: order.total - order.additional_tax_total,
+              shipping: order.shipment_total,
+              sales_tax: order.additional_tax_total
+            )
+        end
+
         private
 
         def order_address_params(address)
diff --git a/spec/super_good/solidus_taxjar/api_params_spec.rb b/spec/super_good/solidus_taxjar/api_params_spec.rb
index 8677153..cb70804 100644
--- a/spec/super_good/solidus_taxjar/api_params_spec.rb
+++ b/spec/super_good/solidus_taxjar/api_params_spec.rb
@@ -3,12 +3,17 @@ require 'spec_helper'
 RSpec.describe SuperGood::SolidusTaxJar::APIParams do
   let(:order) do
     Spree::Order.create!(
-      item_total: 28.00,
-      shipment_total: 3.01,
+      number: "R111222333",
+      total: BigDecimal("123.45"),
+      shipment_total: BigDecimal("3.01"),
+      additional_tax_total: BigDecimal("9.87"),
+      item_total: BigDecimal("28.00"),
       store: store,
       ship_address: ship_address,
       line_items: [line_item]
-    )
+    ).tap do |order|
+      order.update! completed_at: DateTime.new(2018, 3, 6, 12, 10, 33)
+    end
   end
 
   let(:store) do
@@ -138,4 +143,23 @@ RSpec.describe SuperGood::SolidusTaxJar::APIParams do
       ])
     end
   end
+
+  describe "#transaction_params" do
+    subject { described_class.transaction_params(order) }
+
+    it "returns params for creating/updating an order transaction" do
+      expect(subject).to eq({
+       amount: BigDecimal("113.58"),
+       sales_tax: BigDecimal("9.87"),
+       shipping: BigDecimal("3.01"),
+       to_city: "Los Angeles",
+       to_country: "US",
+       to_state: "CA",
+       to_street: "475 N Beverly Dr",
+       to_zip: "90210",
+       transaction_date: "2018-03-06T12:10:33Z",
+       transaction_id: "R111222333",
+      })
+    end
+  end
 end
diff --git a/spec/super_good/solidus_taxjar/api_spec.rb b/spec/super_good/solidus_taxjar/api_spec.rb
index 1b6defd..0bfb67a 100644
--- a/spec/super_good/solidus_taxjar/api_spec.rb
+++ b/spec/super_good/solidus_taxjar/api_spec.rb
@@ -44,4 +44,26 @@ RSpec.describe SuperGood::SolidusTaxJar::API do
 
     it { is_expected.to eq({ some_kind_of: "response" }) }
   end
+
+  describe "create_transaction_for" do
+    subject { api.create_transaction_for order }
+
+    let(:api) { described_class.new(taxjar_client: dummy_client) }
+    let(:dummy_client) { instance_double ::Taxjar::Client }
+    let(:order) { Spree::Order.new }
+
+    before do
+      allow(SuperGood::SolidusTaxJar::APIParams)
+        .to receive(:transaction_params)
+        .with(order)
+        .and_return({ transaction: "params" })
+
+      allow(dummy_client)
+        .to receive(:create_order)
+        .with({ transaction: "params" })
+        .and_return({ some_kind_of: "response" })
+    end
+
+    it { is_expected.to eq({ some_kind_of: "response" }) }
+  end
 end