Email setup

[arelenglish]

I noticed that email sent with the Pay Gem don't have a from address set by default, which makes sense. How would the gem know what email to send from. I'd like to submit a PR to clear up the documentation, but wanted clarify first that it is required to create config/initializers/pay.rb then add at least the following:

Pay.setup do |config|
  config.support_email = "[email protected]"
end 

Are other variables required to be set? I see that business name and address are in the mailer, but assume they would just not render anything if blank.

[excid3]

https://github.com/pay-rails/pay/blob/master/app/mailers/pay/application_mailer.rb#L3

[arelenglish]

Right, so if that's not set in the initializer, your emails won't be able to send because from will be null. The docs read as if adding the initializer is optional.

[excid3]

We can update it to fallback to the ActionMailer default from address. Want to make a PR for that?

[arelenglish]

Sure! I'll do it soon!

[excid3]

Awesome, thanks! 😄

[arelenglish]

And for anyone who comes here, PR is here: #587