Add SolidusTaxJar::API#tax_rate_for

When calculating tax rates, the recommended endpoint from TaxJar
support for live calculations is `/v2/taxes`, the same used for
calculating order taxes, as it accounts for all factors like
sourcing or nexus, while the `/v2/rates` endpoint will return
the full combined rate for the queried location.

1 files changed, 4 insertions, 0 deletions

diff --git a/lib/super_good/solidus_taxjar/api.rb b/lib/super_good/solidus_taxjar/api.rb
index 0d182ce..601a2ae 100644
--- a/lib/super_good/solidus_taxjar/api.rb
+++ b/lib/super_good/solidus_taxjar/api.rb
@@ -22,6 +22,10 @@ module SuperGood
         end
       end
 
+      def tax_rate_for(address)
+        taxjar_client.tax_for_order(APIParams.tax_rate_address_params(address)).rate
+      end
+
       def tax_rates_for(address)
         taxjar_client.rates_for_location(*APIParams.address_params(address))
       end