old_contents: from django.core.exceptions import ImproperlyConfigured
  from django.utils.translation import ugettext as _
  from mezzanine.conf import settings
  
  from cartridge.shop.checkout import CheckoutError
  
  # Requires Stripe Library Module -- install from pypi.
  try:
      import stripe
  except ImportError:
      raise ImproperlyConfigured("stripe package must be installed")
  
  try:
      stripe.api_key = settings.STRIPE_API_KEY
  except AttributeError:
      raise ImproperlyConfigured("You need to define STRIPE_API_KEY "
                                 "in your settings module to use the "
                                 "stripe payment processor.")
  
  
  def process(request, order_form, order):
      """
      Payment handler for the stripe API.
      """
      data = {
          "amount": int((order.total * 100).to_integral()),
          "currency": settings.STRIPE_CURRENCY,
          "card": {
              'number': request.POST["card_number"].strip(),
              'exp_month': request.POST["card_expiry_month"].strip(),
              'exp_year': request.POST["card_expiry_year"][2:].strip(),
              'cvc': request.POST["card_ccv"].strip(),
              'address_line1': request.POST['billing_detail_street'],
              'address_city': request.POST['billing_detail_city'],
              'address_state': request.POST['billing_detail_state'],
              'address_zip': request.POST['billing_detail_postcode'],
              'country': request.POST['billing_detail_country'],
          },
      }
      try:
          response = stripe.Charge.create(**data)
      except stripe.CardError:
          raise CheckoutError(_("Transaction declined"))
      except Exception, e:
          raise CheckoutError(_("A general error occured: ") + str(e))
      return response.id
  
new_contents: from django.core.exceptions import ImproperlyConfigured
  from django.utils.translation import ugettext as _
  from mezzanine.conf import settings
  
  from cartridge.shop.checkout import CheckoutError
  
  # Requires Stripe Library Module -- install from pypi.
  try:
      import stripe
  except ImportError:
      raise ImproperlyConfigured("stripe package must be installed")
  
  try:
      stripe.api_key = settings.STRIPE_API_KEY
  except AttributeError:
      raise ImproperlyConfigured("You need to define STRIPE_API_KEY "
                                 "in your settings module to use the "
                                 "stripe payment processor.")
  
  
  def process(request, order_form, order):
      """
      Payment handler for the stripe API.
      """
      data = {
          "amount": int((order.total * 100).to_integral()),
          "currency": getattr(settings, "STRIPE_CURRENCY", "usd"),
          "card": {
              'number': request.POST["card_number"].strip(),
              'exp_month': request.POST["card_expiry_month"].strip(),
              'exp_year': request.POST["card_expiry_year"][2:].strip(),
              'cvc': request.POST["card_ccv"].strip(),
              'address_line1': request.POST['billing_detail_street'],
              'address_city': request.POST['billing_detail_city'],
              'address_state': request.POST['billing_detail_state'],
              'address_zip': request.POST['billing_detail_postcode'],
              'country': request.POST['billing_detail_country'],
          },
      }
      try:
          response = stripe.Charge.create(**data)
      except stripe.CardError:
          raise CheckoutError(_("Transaction declined"))
      except Exception, e:
          raise CheckoutError(_("A general error occured: ") + str(e))
      return response.id
  
subject: Make STRIPE_CURRENCY setting backwards compatible.