diff --git a/README.md b/README.md
index e2546fc..112e9de 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,8 @@
 # ebay
 
-ebay is a Go client library for accessing the [eBay API](https://developer.ebay.com/).
\ No newline at end of file
+ebay is a Go client library for accessing the [eBay API](https://developer.ebay.com/).
+
+
+# Thanks
+
+- https://github.com/google/go-github for their library design.
\ No newline at end of file
diff --git a/browse.go b/browse.go
index bffd9ca..c54eef8 100644
--- a/browse.go
+++ b/browse.go
@@ -28,13 +28,287 @@ func OptBrowseContextualLocation(country, zip string) func(*http.Request) {
 }
 
 // Item represents an eBay item.
-type Item struct{}
+type Item struct {
+	AdditionalImages []struct {
+		Height   string `json:"height"`
+		ImageURL string `json:"imageUrl"`
+		Width    string `json:"width"`
+	} `json:"additionalImages"`
+	AdultOnly       string   `json:"adultOnly"`
+	AgeGroup        string   `json:"ageGroup"`
+	BidCount        string   `json:"bidCount"`
+	Brand           string   `json:"brand"`
+	BuyingOptions   []string `json:"buyingOptions"`
+	CategoryID      string   `json:"categoryId"`
+	CategoryPath    string   `json:"categoryPath"`
+	Color           string   `json:"color"`
+	Condition       string   `json:"condition"`
+	ConditionID     string   `json:"conditionId"`
+	CurrentBidPrice struct {
+		ConvertedFromCurrency string `json:"convertedFromCurrency"`
+		ConvertedFromValue    string `json:"convertedFromValue"`
+		Currency              string `json:"currency"`
+		Value                 string `json:"value"`
+	} `json:"currentBidPrice"`
+	Description             string `json:"description"`
+	EnabledForGuestCheckout string `json:"enabledForGuestCheckout"`
+	EnergyEfficiencyClass   string `json:"energyEfficiencyClass"`
+	Epid                    string `json:"epid"`
+	EstimatedAvailabilities []struct {
+		AvailabilityThreshold       string   `json:"availabilityThreshold"`
+		AvailabilityThresholdType   string   `json:"availabilityThresholdType"`
+		DeliveryOptions             []string `json:"deliveryOptions"`
+		EstimatedAvailabilityStatus string   `json:"estimatedAvailabilityStatus"`
+		EstimatedAvailableQuantity  string   `json:"estimatedAvailableQuantity"`
+		EstimatedSoldQuantity       string   `json:"estimatedSoldQuantity"`
+	} `json:"estimatedAvailabilities"`
+	Gender string `json:"gender"`
+	Gtin   string `json:"gtin"`
+	Image  struct {
+		Height   string `json:"height"`
+		ImageURL string `json:"imageUrl"`
+		Width    string `json:"width"`
+	} `json:"image"`
+	InferredEpid        string `json:"inferredEpid"`
+	ItemAffiliateWebURL string `json:"itemAffiliateWebUrl"`
+	ItemEndDate         string `json:"itemEndDate"`
+	ItemID              string `json:"itemId"`
+	ItemLocation        struct {
+		AddressLine1    string `json:"addressLine1"`
+		AddressLine2    string `json:"addressLine2"`
+		City            string `json:"city"`
+		Country         string `json:"country"`
+		County          string `json:"county"`
+		PostalCode      string `json:"postalCode"`
+		StateOrProvince string `json:"stateOrProvince"`
+	} `json:"itemLocation"`
+	ItemWebURL       string `json:"itemWebUrl"`
+	LocalizedAspects []struct {
+		Name  string `json:"name"`
+		Type  string `json:"type"`
+		Value string `json:"value"`
+	} `json:"localizedAspects"`
+	MarketingPrice struct {
+		DiscountAmount struct {
+			ConvertedFromCurrency string `json:"convertedFromCurrency"`
+			ConvertedFromValue    string `json:"convertedFromValue"`
+			Currency              string `json:"currency"`
+			Value                 string `json:"value"`
+		} `json:"discountAmount"`
+		DiscountPercentage string `json:"discountPercentage"`
+		OriginalPrice      struct {
+			ConvertedFromCurrency string `json:"convertedFromCurrency"`
+			ConvertedFromValue    string `json:"convertedFromValue"`
+			Currency              string `json:"currency"`
+			Value                 string `json:"value"`
+		} `json:"originalPrice"`
+	} `json:"marketingPrice"`
+	Material          string `json:"material"`
+	MinimumPriceToBid struct {
+		ConvertedFromCurrency string `json:"convertedFromCurrency"`
+		ConvertedFromValue    string `json:"convertedFromValue"`
+		Currency              string `json:"currency"`
+		Value                 string `json:"value"`
+	} `json:"minimumPriceToBid"`
+	Mpn     string `json:"mpn"`
+	Pattern string `json:"pattern"`
+	Price   struct {
+		ConvertedFromCurrency string `json:"convertedFromCurrency"`
+		ConvertedFromValue    string `json:"convertedFromValue"`
+		Currency              string `json:"currency"`
+		Value                 string `json:"value"`
+	} `json:"price"`
+	PriceDisplayCondition string `json:"priceDisplayCondition"`
+	PrimaryItemGroup      struct {
+		ItemGroupAdditionalImages []struct {
+			Height   string `json:"height"`
+			ImageURL string `json:"imageUrl"`
+			Width    string `json:"width"`
+		} `json:"itemGroupAdditionalImages"`
+		ItemGroupHref  string `json:"itemGroupHref"`
+		ItemGroupID    string `json:"itemGroupId"`
+		ItemGroupImage struct {
+			Height   string `json:"height"`
+			ImageURL string `json:"imageUrl"`
+			Width    string `json:"width"`
+		} `json:"itemGroupImage"`
+		ItemGroupTitle string `json:"itemGroupTitle"`
+		ItemGroupType  string `json:"itemGroupType"`
+	} `json:"primaryItemGroup"`
+	PrimaryProductReviewRating struct {
+		AverageRating    string `json:"averageRating"`
+		RatingHistograms []struct {
+			Count  string `json:"count"`
+			Rating string `json:"rating"`
+		} `json:"ratingHistograms"`
+		ReviewCount string `json:"reviewCount"`
+	} `json:"primaryProductReviewRating"`
+	Product struct {
+		AdditionalImages []struct {
+			Height   string `json:"height"`
+			ImageURL string `json:"imageUrl"`
+			Width    string `json:"width"`
+		} `json:"additionalImages"`
+		AdditionalProductIdentities []struct {
+			ProductIdentity []struct {
+				IdentifierType  string `json:"identifierType"`
+				IdentifierValue string `json:"identifierValue"`
+			} `json:"productIdentity"`
+		} `json:"additionalProductIdentities"`
+		AspectGroups []struct {
+			Aspects []struct {
+				LocalizedName   string   `json:"localizedName"`
+				LocalizedValues []string `json:"localizedValues"`
+			} `json:"aspects"`
+			LocalizedGroupName string `json:"localizedGroupName"`
+		} `json:"aspectGroups"`
+		Brand       string   `json:"brand"`
+		Description string   `json:"description"`
+		Gtins       []string `json:"gtins"`
+		Image       struct {
+			Height   string `json:"height"`
+			ImageURL string `json:"imageUrl"`
+			Width    string `json:"width"`
+		} `json:"image"`
+		Mpns  []string `json:"mpns"`
+		Title string   `json:"title"`
+	} `json:"product"`
+	ProductFicheWebURL    string `json:"productFicheWebUrl"`
+	QuantityLimitPerBuyer string `json:"quantityLimitPerBuyer"`
+	ReservePriceMet       string `json:"reservePriceMet"`
+	ReturnTerms           struct {
+		ExtendedHolidayReturnsOffered string `json:"extendedHolidayReturnsOffered"`
+		RefundMethod                  string `json:"refundMethod"`
+		RestockingFeePercentage       string `json:"restockingFeePercentage"`
+		ReturnInstructions            string `json:"returnInstructions"`
+		ReturnMethod                  string `json:"returnMethod"`
+		ReturnPeriod                  struct {
+			Unit  string `json:"unit"`
+			Value string `json:"value"`
+		} `json:"returnPeriod"`
+		ReturnsAccepted         string `json:"returnsAccepted"`
+		ReturnShippingCostPayer string `json:"returnShippingCostPayer"`
+	} `json:"returnTerms"`
+	Seller struct {
+		FeedbackPercentage string `json:"feedbackPercentage"`
+		FeedbackScore      string `json:"feedbackScore"`
+		SellerAccountType  string `json:"sellerAccountType"`
+		SellerLegalInfo    struct {
+			Email                      string `json:"email"`
+			Fax                        string `json:"fax"`
+			Imprint                    string `json:"imprint"`
+			LegalContactFirstName      string `json:"legalContactFirstName"`
+			LegalContactLastName       string `json:"legalContactLastName"`
+			Name                       string `json:"name"`
+			Phone                      string `json:"phone"`
+			RegistrationNumber         string `json:"registrationNumber"`
+			SellerProvidedLegalAddress struct {
+				AddressLine1    string `json:"addressLine1"`
+				AddressLine2    string `json:"addressLine2"`
+				City            string `json:"city"`
+				Country         string `json:"country"`
+				CountryName     string `json:"countryName"`
+				County          string `json:"county"`
+				PostalCode      string `json:"postalCode"`
+				StateOrProvince string `json:"stateOrProvince"`
+			} `json:"sellerProvidedLegalAddress"`
+			TermsOfService string `json:"termsOfService"`
+			VatDetails     []struct {
+				IssuingCountry string `json:"issuingCountry"`
+				VatID          string `json:"vatId"`
+			} `json:"vatDetails"`
+		} `json:"sellerLegalInfo"`
+		Username string `json:"username"`
+	} `json:"seller"`
+	SellerItemRevision string `json:"sellerItemRevision"`
+	ShippingOptions    []struct {
+		AdditionalShippingCostPerUnit struct {
+			ConvertedFromCurrency string `json:"convertedFromCurrency"`
+			ConvertedFromValue    string `json:"convertedFromValue"`
+			Currency              string `json:"currency"`
+			Value                 string `json:"value"`
+		} `json:"additionalShippingCostPerUnit"`
+		CutOffDateUsedForEstimate string `json:"cutOffDateUsedForEstimate"`
+		MaxEstimatedDeliveryDate  string `json:"maxEstimatedDeliveryDate"`
+		MinEstimatedDeliveryDate  string `json:"minEstimatedDeliveryDate"`
+		QuantityUsedForEstimate   string `json:"quantityUsedForEstimate"`
+		ShippingCarrierCode       string `json:"shippingCarrierCode"`
+		ShippingCost              struct {
+			ConvertedFromCurrency string `json:"convertedFromCurrency"`
+			ConvertedFromValue    string `json:"convertedFromValue"`
+			Currency              string `json:"currency"`
+			Value                 string `json:"value"`
+		} `json:"shippingCost"`
+		ShippingCostType              string `json:"shippingCostType"`
+		ShippingServiceCode           string `json:"shippingServiceCode"`
+		ShipToLocationUsedForEstimate struct {
+			Country    string `json:"country"`
+			PostalCode string `json:"postalCode"`
+		} `json:"shipToLocationUsedForEstimate"`
+		TrademarkSymbol string `json:"trademarkSymbol"`
+		Type            string `json:"type"`
+	} `json:"shippingOptions"`
+	ShipToLocations struct {
+		RegionExcluded []struct {
+			RegionName string `json:"regionName"`
+			RegionType string `json:"regionType"`
+		} `json:"regionExcluded"`
+		RegionIncluded []struct {
+			RegionName string `json:"regionName"`
+			RegionType string `json:"regionType"`
+		} `json:"regionIncluded"`
+	} `json:"shipToLocations"`
+	ShortDescription string `json:"shortDescription"`
+	Size             string `json:"size"`
+	SizeSystem       string `json:"sizeSystem"`
+	SizeType         string `json:"sizeType"`
+	Subtitle         string `json:"subtitle"`
+	Taxes            []struct {
+		EbayCollectAndRemitTax   string `json:"ebayCollectAndRemitTax"`
+		IncludedInPrice          string `json:"includedInPrice"`
+		ShippingAndHandlingTaxed string `json:"shippingAndHandlingTaxed"`
+		TaxJurisdiction          struct {
+			Region struct {
+				RegionName string `json:"regionName"`
+				RegionType string `json:"regionType"`
+			} `json:"region"`
+			TaxJurisdictionID string `json:"taxJurisdictionId"`
+		} `json:"taxJurisdiction"`
+		TaxPercentage string `json:"taxPercentage"`
+		TaxType       string `json:"taxType"`
+	} `json:"taxes"`
+	Title                    string `json:"title"`
+	TopRatedBuyingExperience string `json:"topRatedBuyingExperience"`
+	UniqueBidderCount        string `json:"uniqueBidderCount"`
+	UnitPrice                struct {
+		ConvertedFromCurrency string `json:"convertedFromCurrency"`
+		ConvertedFromValue    string `json:"convertedFromValue"`
+		Currency              string `json:"currency"`
+		Value                 string `json:"value"`
+	} `json:"unitPrice"`
+	UnitPricingMeasure string `json:"unitPricingMeasure"`
+	Warnings           []struct {
+		Category     string   `json:"category"`
+		Domain       string   `json:"domain"`
+		ErrorID      string   `json:"errorId"`
+		InputRefIds  []string `json:"inputRefIds"`
+		LongMessage  string   `json:"longMessage"`
+		Message      string   `json:"message"`
+		OutputRefIds []string `json:"outputRefIds"`
+		Parameters   []struct {
+			Name  string `json:"name"`
+			Value string `json:"value"`
+		} `json:"parameters"`
+		Subdomain string `json:"subdomain"`
+	} `json:"warnings"`
+}
 
 // GetItem retrieves the details of a specific item.
+// Fieldgroups valid values are "PRODUCT" and "COMPACT".
 //
 // eBay API docs: https://developer.ebay.com/api-docs/buy/browse/resources/item/methods/getItem
-func (s *BrowseService) GetItem(ctx context.Context, itemID string, opts ...Opt) (Item, error) {
-	u := fmt.Sprintf("buy/browse/v1/item/%s", itemID)
+func (s *BrowseService) GetItem(ctx context.Context, itemID string, fieldgroups string, opts ...Opt) (Item, error) {
+	u := fmt.Sprintf("buy/browse/v1/item/%s?fieldgroups=%s", itemID, fieldgroups)
 	req, err := s.client.NewRequest(http.MethodGet, u, opts...)
 	if err != nil {
 		return Item{}, err
diff --git a/browse_test.go b/browse_test.go
index 6f84edc..3eebd4f 100644
--- a/browse_test.go
+++ b/browse_test.go
@@ -1,6 +1,8 @@
 package ebay_test
 
 import (
+	"context"
+	"fmt"
 	"net/http"
 	"testing"
 
@@ -20,3 +22,17 @@ func TestOptBrowseContextualLocationExistingHeader(t *testing.T) {
 	ebay.OptBrowseContextualLocation("US", "19406")(r)
 	assert.Equal(t, "affiliateCampaignId=1,contextualLocation=country%3DUS%2Czip%3D19406", r.Header.Get("X-EBAY-C-ENDUSERCTX"))
 }
+
+func TestGetItem(t *testing.T) {
+	client, mux, teardown := setup(t)
+	defer teardown()
+
+	mux.HandleFunc("/buy/browse/v1/item/v1|202117468662|0", func(w http.ResponseWriter, r *http.Request) {
+		fmt.Fprintf(w, `{"itemId": "v1|202117468662|0", "title": "%s"}`, r.URL.Query().Get("fieldgroups"))
+	})
+
+	item, err := client.Buy.Browse.GetItem(context.Background(), "v1|202117468662|0", "COMPACT")
+	assert.Nil(t, err)
+	assert.Equal(t, "v1|202117468662|0", item.ItemID)
+	assert.Equal(t, "COMPACT", item.Title)
+}
diff --git a/ebay.go b/ebay.go
index d3e5a95..2667787 100644
--- a/ebay.go
+++ b/ebay.go
@@ -3,6 +3,7 @@ package ebay
 import (
 	"context"
 	"encoding/json"
+	"errors"
 	"fmt"
 	"net/http"
 	"net/url"
@@ -76,6 +77,9 @@ type Opt func(*http.Request)
 // NewRequest creates an API request.
 // url should always be specified without a preceding slash.
 func (c *Client) NewRequest(method, url string, opts ...Opt) (*http.Request, error) {
+	if strings.HasPrefix(url, "/") {
+		return nil, errors.New("url should always be specified without a preceding slash")
+	}
 	u, err := c.baseURL.Parse(url)
 	if err != nil {
 		return nil, err
diff --git a/ebay_test.go b/ebay_test.go
index 2228700..3d2f311 100644
--- a/ebay_test.go
+++ b/ebay_test.go
@@ -5,6 +5,7 @@ import (
 	"fmt"
 	"io/ioutil"
 	"net/http"
+	"net/http/httptest"
 	"testing"
 
 	"github.com/jybp/ebay"
@@ -66,3 +67,15 @@ func TestCheckResponse(t *testing.T) {
 	assert.Equal(t, "itemId", err.Errors[0].Parameters[0].Name)
 	assert.Equal(t, "2200077988|0", err.Errors[0].Parameters[0].Value)
 }
+
+// setup sets up a test HTTP server
+func setup(t *testing.T) (client *ebay.Client, mux *http.ServeMux, teardown func()) {
+	mux = http.NewServeMux()
+	server := httptest.NewServer(mux)
+	var err error
+	client, err = ebay.NewCustomClient(nil, server.URL+"/")
+	if err != nil {
+		t.Fatal(err)
+	}
+	return client, mux, server.Close
+}
diff --git a/test/integration/browse_test.go b/test/integration/ebay_test.go
similarity index 90%
rename from test/integration/browse_test.go
rename to test/integration/ebay_test.go
index 7c65755..1538ca6 100644
--- a/test/integration/browse_test.go
+++ b/test/integration/ebay_test.go
@@ -1,4 +1,5 @@
 // +build integration
+
 package integration
 
 import (
@@ -28,8 +29,8 @@ func init() {
 	client = ebay.NewSandboxClient(conf.Client(context.Background()))
 }
 
+// https://developer.ebay.com/my/api_test_tool?index=0&api=browse&call=item_summary_search__GET&variation=json
 func TestAuthorization(t *testing.T) {
-	// https://developer.ebay.com/my/api_test_tool?index=0&api=browse&call=item_summary_search__GET&variation=json
 	req, err := client.NewRequest("GET", "buy/browse/v1/item_summary/search?q=test")
 	if err != nil {
 		t.Fatal(err)