def pricing_tiers
      @pricing_tiers ||= begin
        r = request(:get, 'ra/apps/pricing/matrix')
        data = parse_response(r, 'data')['pricingTiers']
        data.map { |tier| Spaceship::Tunes::PricingTier.factory(tier) }
      end
    end
def pricing_tiers
      @pricing_tiers ||= begin
        r = request(:get, 'ra/apps/pricing/matrix')
        data = parse_response(r, 'data')['pricingTiers']
        data.map { |tier| Spaceship::Tunes::PricingTier.factory(tier) }
      end
    end
Returns an array of all available pricing tiers

 @note Although this information is publicly available, the current spaceship implementation requires you to have a logged in client to access it

 @return [Array] the PricingTier objects (Spaceship::Tunes::PricingTier)
 [{
   "tierStem": "0",
   "tierName": "Free",
   "pricingInfo": [{
       "country": "United States",
       "countryCode": "US",
       "currencySymbol": "$",
       "currencyCode": "USD",
       "wholesalePrice": 0.0,
       "retailPrice": 0.0,
       "fRetailPrice": "$0.00",
       "fWholesalePrice": "$0.00"
     }, {
     ...
 }, {
 ...