Skrill redirect error "JBWEB000120: The request sent by the client was syntactically incorrect."

Question

I'm using Skrill payment method in my asp.net web application.

When clicked on booking button it redirects to the Skrill for payments as:

protected void btnBook_Click(object sender, EventArgs e)
{
    // Mastercard   5438311234567890
    // Visa         4000001234567890
    // Amex         371234500012340

    string url = "https://pay.skrill.com/?";

    // Merchant Details
    url += "pay_to_email=" + "demoqco@sun-fish.com";
    url += "&recipient_description=" + "Banquet Halls Booking System";
    url += "&language=" + "EN";
    url += "&status_url=" + "";

    // Customer Details
    url += "&country=" + "Pakistan";

    // Payment Details
    url += "&amount=" + string.Format("{0:0.00}", (double.Parse(lblGrandTotal.Text) / 110.00));
    url += "&currency=" + "USD";
    url += "&amount2_description=" + Persons.Text + ":";
    url += "&amount2=" + lblPersons.Text;
    url += "&amount3_description=" + PerHeadRate.Text + ":";
    url += "&amount3=" + lblPerHeadRate.Text;
    url += "&amount4_description=" + Tax.Text + ":";
    url += "&amount4=" + lblTax.Text + "%";
    url += "&detail1_description=" + "Booking ID:";
    url += "&detail1_text=" + objDLBkg.SelectLastBkID();
    url += "&detail2_description=" + "Description:";
    url += "&detail2_text=" + "View all bookings in your Account.";
    url += "&detail3_description=" + "Banquet Hall:";
    url += "&detail3_text=" + lblBqtName.Text;
    url += "&detail4_description=" + "Booking Date:";
    url += "&detail4_text=" + DateTime.Now.Date.ToString("MM/dd/yyyy");

    // Split Gateway
    url += "&payment_methods=" + "WLT,ACC";

    Response.Redirect(url);
}

And shows error on redirect to Skrill:

JBWEB000065: HTTP Status 400 -

---

JBWEB000309: type JBWEB000067: Status report
JBWEB000068: message
JBWEB000069: description JBWEB000120: The request sent by the client was syntactically incorrect.

---

JBoss Web/7.5.9.Final-redhat-1

How I can solve it? Where I'm wrong?

Answer 1

I've figured out that there is a special character % used in my redirect server-URL that's caused the error here:

url += "&amount4=" + lblTax.Text + "%";

Just removed % character from URL and it worked.