diff --git a/item.go b/item.go
index 9b8915d..5d33d3a 100644
--- a/item.go
+++ b/item.go
@@ -8,6 +8,7 @@ import (
 	"net/http"
 	"net/url"
 	"strconv"
+	"strings"
 )
 
 // Item struct containing data on retrieved items
@@ -40,25 +41,43 @@ func (s *Session) HasItem(id int) (bool, error) {
 }
 
 // AddItem add item by id to inventory
-func (s *Session) AddItem(id int, seller int) error {
-	v := url.Values{}
-	v.Set("rqtype", "purchase")
-	v.Set("productID", strconv.Itoa(id))
-	v.Set("expectedCurrency", "1")
-	v.Set("expectedPrice", "0")
-	v.Set("expectedSellerID", strconv.Itoa(seller))
-	v.Set("userAssetID", "")
-	resp, err := s.client.Post("https://www.roblox.com/api/item.ashx?"+v.Encode(), "application/json", bytes.NewBufferString(""))
+func (s *Session) AddItem(id int) error {
+	product, err := s.GetProduct(id)
 	if err != nil {
 		return err
 	}
 
+	payload := struct {
+		ExpectedCurrency int `json:"expectedCurrency"`
+		ExpectedPrice    int `json:"expectedPrice"`
+		ExpectedSellerID int `json:"expectedSellerId"`
+	}{
+		ExpectedCurrency: 1,
+		ExpectedPrice: 0,
+		ExpectedSellerID: product.Creator.ID,
+	}
+	// Gen json body
+	data, err := json.Marshal(&payload)
+	if err != nil {
+		return err
+	}
+
+	req, err := http.NewRequest("POST", fmt.Sprintf("https://economy.roblox.com/v1/purchases/products/%d", product.ProductID), bytes.NewBuffer(data))
+	if err != nil {
+		return err
+	}
+	req.Header.Set("Content-Type", "application/json")
+
+	resp, err := s.client.Do(req)
+	if err != nil {
+		return err
+	}
 	defer resp.Body.Close()
 
 	if resp.StatusCode == 403 {
-		req, err := http.NewRequest("POST", "https://www.roblox.com/api/item.ashx?"+v.Encode(), bytes.NewBufferString(""))
-		req.Header.Set("X-Csrf-Token", resp.Header["X-Csrf-Token"][0])
+		req, err := http.NewRequest("POST", fmt.Sprintf("https://economy.roblox.com/v1/purchases/products/%d", product.ProductID), bytes.NewBuffer(data))
 		req.Header.Set("Content-Type", "application/json")
+		req.Header.Set("X-Csrf-Token", resp.Header["X-Csrf-Token"][0])
 
 		resp, err := s.client.Do(req)
 		if err != nil {
@@ -87,7 +106,7 @@ func (s *Session) RemoveItem(id int) error {
 
 	if resp.StatusCode == 403 {
 		req, err := http.NewRequest("POST", "https://www.roblox.com/asset/delete-from-inventory", bytes.NewBufferString(v.Encode()))
-		req.Header.Set("X-Csrf-Token", resp.Header["X-Csrf-Token"][0])
+		req.Header.Set("x-csrf-token", strings.Trim(resp.Header["X-Csrf-Token"][0], " "))
 		req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
 
 		resp, err := s.client.Do(req)
diff --git a/session.go b/session.go
index 2106614..b32979a 100644
--- a/session.go
+++ b/session.go
@@ -24,6 +24,7 @@ func New(cookie string) (*Session, error) {
 	//  url.Parse("http://www.roblox.com") // http://api.roblox.com
 	cookieJar.SetCookies(&url.URL{Scheme: "http", Host: "www.roblox.com"}, rbxCookie)
 	cookieJar.SetCookies(&url.URL{Scheme: "http", Host: "api.roblox.com"}, rbxCookie)
+	cookieJar.SetCookies(&url.URL{Scheme: "https", Host: "economy.roblox.com"}, rbxCookie)
 	client := &http.Client{
 		Jar: cookieJar,
 	}