Fill in a Stripe Elements (https://stripe.com/docs/elements) credit card field using capybara

capybara_fill_stripe_elements.rb

def fill_stripe_elements(card)
  using_wait_time(15) { within_frame('stripeField_card_element0') do
    card.to_s.chars.each do |piece|
      find_field('cardnumber').send_keys(piece)
    end

    find_field('exp-date').send_keys("0122")
    find_field('cvc').send_keys '123'
    find_field('postal').send_keys '19335'
  end }
end

fill_stripe_elements(4242424242424242)