ImgBBExtension

using System.Net;
using System.Text;
using Newtonsoft.Json.Linq;
using System.Collections.Specialized;

namespace MyShop.Tools
{
    public class ImgBBExtension
    {
        private static readonly string _apiKey = "507d546dd56ee58e4da9ce88*********";
        private static readonly string _apiUrl = "https://api.imgbb.com/1/upload";

        public static string UploadImage(string imageBase64Data)
        {
            using (WebClient client = new WebClient())
            {
                NameValueCollection param = new NameValueCollection();
                param.Add("key", _apiKey);
                param.Add("image", imageBase64Data);

                var response = client.UploadValues(_apiUrl, "POST", param);
                var result = Encoding.UTF8.GetString(response);

                var json = JObject.Parse(result);
                var imageUrl = (string) json["data"]["url"];

                return imageUrl;
            }
        }
    }
}