var api = new PastebinAPI();
api.APIKey = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx";

var createRequest = new PasteCreateRequest();
createRequest.Code = "Paste Code";
createRequest.Name = "Test Title";
createRequest.ExpireDate = PasteExpireDate.Hour;
createRequest.Private = PastePrivate.Public;
createRequest.Format = "text";
createRequest.UserKey = string.Empty; // Set UserKey In Login,  Empty(or null) In Guest

var url = api.CreatePaste(createRequest);
https://bit.ly/3xHsbHV