diff --git a/.gitignore b/.gitignore
index 094d3e7..202c883 100644
--- a/.gitignore
+++ b/.gitignore
@@ -9,3 +9,4 @@ Gemfile.lock
 coverage
 .ruby-version
 pkg
+.env
diff --git a/Gemfile b/Gemfile
index 4e30e9d..36e521c 100644
--- a/Gemfile
+++ b/Gemfile
@@ -3,8 +3,15 @@ source "https://rubygems.org"
 branch = ENV.fetch('SOLIDUS_BRANCH', 'master')
 gem "solidus", github: "solidusio/solidus", branch: branch
 
+# ActiveMerchant v1.58 through v1.59 introduced a breaking change
+# to the stripe gateway.
+#
+# This was resolved in v1.60, but we still need to skip 1.58 & 1.59.
+gem "activemerchant", "~> 1.48", "!= 1.58.0", "!= 1.59.0", github: "dynamomtl/active_merchant_new", branch: 'feature/shopify/prototype-implementation'
+
 group :development, :test do
   gem "pry-rails"
+  gem "dotenv-rails", require: 'dotenv/rails-now'
 end
 
 gem 'pg'
diff --git a/app/models/spree/gateway/shopify_gateway.rb b/app/models/spree/gateway/shopify_gateway.rb
new file mode 100644
index 0000000..934f090
--- /dev/null
+++ b/app/models/spree/gateway/shopify_gateway.rb
@@ -0,0 +1,46 @@
+module Spree
+  class Gateway::ShopifyGateway < Gateway
+    preference :api_key, :string
+    preference :password, :string
+    preference :shop_name, :string
+
+    def provider_class
+      ActiveMerchant::Billing::ShopifyGateway
+    end
+
+    def method_type
+      'shopify'
+    end
+
+    def credit(money, transaction_id, gateway_options)
+      refund = gateway_options[:originator]
+      options = { order_id: refund.pos_order_id, reason: refund.reason.name }
+      provider.refund(money, transaction_id, options)
+    end
+
+    def void(transaction_id, gateway_options)
+      pos_order_id = gateway_options[:originator].pos_order_id
+      provider.void(transaction_id, order_id: pos_order_id)
+    end
+
+    def cancel(_transaction_id)
+      raise NotImplementedError
+    end
+
+    def purchase(_money, _creditcard, _gateway_options)
+      raise NotImplementedError
+    end
+
+    def authorize(_money, _creditcard, _gateway_options)
+      raise NotImplementedError
+    end
+
+    def capture(_money, _response_code, _gateway_options)
+      raise NotImplementedError
+    end
+
+    def create_profile(_payment)
+      raise NotImplementedError
+    end
+  end
+end
diff --git a/lib/spree_gateway/engine.rb b/lib/spree_gateway/engine.rb
index 6f00024..629e95d 100644
--- a/lib/spree_gateway/engine.rb
+++ b/lib/spree_gateway/engine.rb
@@ -28,6 +28,7 @@ class Engine < Rails::Engine
         app.config.spree.payment_methods << Spree::Gateway::Paymill
         app.config.spree.payment_methods << Spree::Gateway::PayflowPro
         app.config.spree.payment_methods << Spree::Gateway::SecurePayAU
+        app.config.spree.payment_methods << Spree::Gateway::ShopifyGateway
         app.config.spree.payment_methods << Spree::Gateway::Maxipago
         app.config.spree.payment_methods << Spree::Gateway::Migs
         app.config.spree.payment_methods << Spree::Gateway::SpreedlyCoreGateway
diff --git a/solidus_gateway.gemspec b/solidus_gateway.gemspec
index 0eb62f1..628cca3 100644
--- a/solidus_gateway.gemspec
+++ b/solidus_gateway.gemspec
@@ -11,7 +11,7 @@ Gem::Specification.new do |s|
   s.version     = SolidusGateway::VERSION
   s.summary     = "Additional Payment Gateways for Solidus"
   s.description = s.summary
-  s.required_ruby_version = ">= 2.1"
+  s.required_ruby_version = ">= 2.3"
 
   s.author       = "Solidus Team"
   s.email        = "contact@solidus.io"
@@ -25,12 +25,6 @@ Gem::Specification.new do |s|
 
   s.add_dependency "solidus_core", "~> 1.1"
 
-  # ActiveMerchant v1.58 through v1.59 introduced a breaking change
-  # to the stripe gateway.
-  #
-  # This was resolved in v1.60, but we still need to skip 1.58 & 1.59.
-  s.add_dependency "activemerchant", "~> 1.48", "!= 1.58.0", "!= 1.59.0"
-
   s.add_development_dependency "braintree", "~> 2.0"
   s.add_development_dependency "rspec-rails", "~> 3.2"
   s.add_development_dependency "simplecov"
@@ -41,4 +35,7 @@ Gem::Specification.new do |s|
   s.add_development_dependency "capybara"
   s.add_development_dependency "poltergeist", "~> 1.9"
   s.add_development_dependency "database_cleaner", "1.2.0"
+
+  s.add_development_dependency "shopify_api", "~> 4.0"
+  # s.add_development_dependency "dotenv-rails"
 end
diff --git a/spec/models/gateway/shopify_gateway_spec.rb b/spec/models/gateway/shopify_gateway_spec.rb
new file mode 100644
index 0000000..1f0fb10
--- /dev/null
+++ b/spec/models/gateway/shopify_gateway_spec.rb
@@ -0,0 +1,63 @@
+require 'spec_helper'
+
+describe Spree::Gateway::ShopifyGateway do
+  let(:transaction_id) { '0xDEADBEEF' }
+  let(:pos_order_id) { '0xBAADF00D' }
+  let(:refund) { double('refund', pos_order_id: pos_order_id) }
+  let(:refund_reason) { double('refund_reason', name: 'Product not working') }
+  let(:gateway_options) { { originator: refund } }
+
+  let(:provider_class) { ActiveMerchant::Billing::ShopifyGateway }
+  let(:provider_instance) { double('provider', refund: true, void: true) }
+
+  before do
+    subject.preferences = { api_key: ENV['SHOPIFY_API_KEY'],
+                            password: ENV['SHOPIFY_PASSWORD'],
+                            shop_name: ENV['SHOPIFY_SHOP_NAME'] }
+    allow(provider_class).to receive(:new).and_return(provider_instance)
+  end
+
+  context '.void' do
+    it 'calls the provider void method once' do
+      expect(provider_instance).to receive(:void).once
+      void!
+    end
+
+    private
+
+    def void!
+      subject.void(transaction_id, gateway_options)
+    end
+  end
+
+  context '.cancel' do
+    it 'throws an error because it\'s not implemented' do
+      expect { cancel! }.to raise_error(NotImplementedError)
+    end
+
+    private
+
+    def cancel!
+      subject.cancel(transaction_id)
+    end
+  end
+
+  context '.credit' do
+    let(:amount_in_cents) { '100' }
+
+    before do
+      allow(refund).to receive(:reason).and_return(refund_reason)
+    end
+
+    it 'calls the provider refund method once' do
+      expect(provider_instance).to receive(:refund).once
+      refund!
+    end
+
+    private
+
+    def refund!
+      subject.credit(amount_in_cents, transaction_id, originator: refund)
+    end
+  end
+end
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index 72f8644..19d056c 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -17,6 +17,7 @@
 require "database_cleaner"
 require "braintree"
 require "ffaker"
+require "dotenv-rails"
 
 require "spree/testing_support/factories"
 require "spree/testing_support/order_walkthrough"