Creating pacts
With RSpec​
Follow the instructions in the README, this is the default behaviour.
Configuration of the pact creation​
This code would typically go in the pact_helper.rb, which would be required by the files that contain the RSpec Pact specs.
Pact.service_consumer "consumer name" do
  has_pact_with "provider name" do
    mock_service :provider_name do
      port 1234
      host "..." # Optional, defaults to "localhost". Useful when using a standalone mock service.
      standalone false # Optional. If true, does not automatically start a mock service
                       # You must start/stop the mock service manually.
    end
  end
end
With Capybara​
Configure your Rack application to be started by Pact, and tell it what port to run on.
Pact.service_consumer "My Consumer" do
  app your_rack_app
  port 8001
  has_pact_with "My Provider" do
    ...
  end
end