def format_key(key)
      key = key.to_s
      key = key.gsub('PayPal', 'Paypal')
      key = key.gsub('eBay',   'Ebay')
      key = key.gsub('EBay',   'Ebay')
      key.underscore.to_sym
    end
def format_key(key)
      key = key.to_s
      key = key.gsub('PayPal', 'Paypal')
      key = key.gsub('eBay',   'Ebay')
      key = key.gsub('EBay',   'Ebay')
      key.underscore.to_sym
    end
Ensure the key is an underscored Symbol.

 Examples:

     'ApplyBuyerProtection' -> :apply_buyer_protection
     'PayPalEmailAddress'   -> :paypal_email_address
     'SoldOffeBay'          -> :sold_off_ebay

 @return [Symbol] the reformatted key.