Untitled

$payload="{"
        ." \"Keywords\": \"".$keyword."\","
        ." \"Resources\": ["
        ."  \"BrowseNodeInfo.BrowseNodes\","
        ."  \"BrowseNodeInfo.BrowseNodes.Ancestor\","
        ."  \"BrowseNodeInfo.BrowseNodes.SalesRank\","
        ."  \"BrowseNodeInfo.WebsiteSalesRank\","
        ."  \"CustomerReviews.Count\","
        ."  \"CustomerReviews.StarRating\","
        ."  \"Images.Primary.Small\","
        ."  \"Images.Primary.Medium\","
        ."  \"Images.Primary.Large\","
        ."  \"Images.Variants.Small\","
        ."  \"Images.Variants.Medium\","
        ."  \"Images.Variants.Large\","
        ."  \"ItemInfo.ByLineInfo\","
        ."  \"ItemInfo.ContentInfo\","
        ."  \"ItemInfo.ContentRating\","
        ."  \"ItemInfo.Classifications\","
        ."  \"ItemInfo.ExternalIds\","
        ."  \"ItemInfo.Features\","
        ."  \"ItemInfo.ManufactureInfo\","
        ."  \"ItemInfo.ProductInfo\","
        ."  \"ItemInfo.TechnicalInfo\","
        ."  \"ItemInfo.Title\","
        ."  \"ItemInfo.TradeInInfo\","
        ."  \"Offers.Listings.Availability.MaxOrderQuantity\","
        ."  \"Offers.Listings.Availability.Message\","
        ."  \"Offers.Listings.Availability.MinOrderQuantity\","
        ."  \"Offers.Listings.Availability.Type\","
        ."  \"Offers.Listings.Condition\","
        ."  \"Offers.Listings.Condition.SubCondition\","
        ."  \"Offers.Listings.DeliveryInfo.IsAmazonFulfilled\","
        ."  \"Offers.Listings.DeliveryInfo.IsFreeShippingEligible\","
        ."  \"Offers.Listings.DeliveryInfo.IsPrimeEligible\","
        ."  \"Offers.Listings.DeliveryInfo.ShippingCharges\","
        ."  \"Offers.Listings.IsBuyBoxWinner\","
        ."  \"Offers.Listings.LoyaltyPoints.Points\","
        ."  \"Offers.Listings.MerchantInfo\","
        ."  \"Offers.Listings.Price\","
        ."  \"Offers.Listings.ProgramEligibility.IsPrimeExclusive\","
        ."  \"Offers.Listings.ProgramEligibility.IsPrimePantry\","
        ."  \"Offers.Listings.Promotions\","
        ."  \"Offers.Listings.SavingBasis\","
        ."  \"Offers.Summaries.HighestPrice\","
        ."  \"Offers.Summaries.LowestPrice\","
        ."  \"Offers.Summaries.OfferCount\","
        ."  \"ParentASIN\","
        ."  \"RentalOffers.Listings.Availability.MaxOrderQuantity\","
        ."  \"RentalOffers.Listings.Availability.Message\","
        ."  \"RentalOffers.Listings.Availability.MinOrderQuantity\","
        ."  \"RentalOffers.Listings.Availability.Type\","
        ."  \"RentalOffers.Listings.BasePrice\","
        ."  \"RentalOffers.Listings.Condition\","
        ."  \"RentalOffers.Listings.Condition.SubCondition\","
        ."  \"RentalOffers.Listings.DeliveryInfo.IsAmazonFulfilled\","
        ."  \"RentalOffers.Listings.DeliveryInfo.IsFreeShippingEligible\","
        ."  \"RentalOffers.Listings.DeliveryInfo.IsPrimeEligible\","
        ."  \"RentalOffers.Listings.DeliveryInfo.ShippingCharges\","
        ."  \"RentalOffers.Listings.MerchantInfo\","
        ."  \"SearchRefinements\""
        ." ],"
        ." \"PartnerTag\": \"".$tagafiliado."\","
        ." \"PartnerType\": \"Associates\","
        ." \"Marketplace\": \"www.".$marketplace."\""
        ."}";