DateTime startDate = new DateTime(2018, 1, 1);
            DateTime endDate = new DateTime(2019, 12, 31);


            TransactionSearchReq req = new TransactionSearchReq();
            req.TransactionSearchRequest = new TransactionSearchRequestType();
            req.TransactionSearchRequest.StartDate = startDate;
            req.TransactionSearchRequest.EndDate = endDate;
            req.TransactionSearchRequest.Version = "74.0";
            PayPalAPIInterfaceClient client = new PayPalAPIInterfaceClient();

            string username = "";
            string password = "";
            string signature = "";

            UserIdPasswordType userIdPasswordType = new UserIdPasswordType()
            {
                Username = username,
                Password = password,
                Signature = signature
            };

            CustomSecurityHeaderType header = new CustomSecurityHeaderType();
            header.Credentials = userIdPasswordType;

            var result = await client.TransactionSearchAsync(header, req);

            return Ok(result.TransactionSearchResponse1.PaymentTransactions.Where(i => double.Parse(i.GrossAmount.Value) > 0 && i.Type == "Payment" || i.Type == "Donation").Select(i => new {
                GrossAmount = i.GrossAmount.Value,
                NetAmount = i.NetAmount.Value,
                FeeAmount = i.FeeAmount.Value,
                Date = i.Timestamp
            }));