<filename>Products/PloneGetPaid/currencyformatter.py
from Products.PloneGetPaid import interfaces


class CurrencyFormatter(object):

    def currency(self, context):
        """
        @return: Formatted price text
        """

        portal = context.portal_url.getPortalObject()

        # 1. read the setting
        options = interfaces.IGetPaidManagementOptions(portal)

        # 2. format the string
        currency = options.currency_symbol

        return currency

<filename>Products/PloneGetPaid/currencyformatter.py
from Products.PloneGetPaid import interfaces


class CurrencyFormatter(object):

    def currency(self, context):
        """
        @return: Formatted price text
        """

        portal = context.portal_url.getPortalObject()

        # 1. read the setting
        options = interfaces.IGetPaidManagementOptions(portal)

        # 2. format the string
        currency = options.currency_symbol

        return currency

@return: Formatted price text # 1. read the setting # 2. format the string