Retrieve value from the parameter in web service Get Method

Hello c# Corner,

I want to Retrieve value(data) from the parameter in web service Get Method and save to JSON. This is the Function that gets Data(values) from the client side. I and I want to save it to JSON then I will use to charge the Customer Card.

[WebMethod]
public string GetSubscriptionRequest(string Name, string Email, string CardNumber, string ExpirationMonth, string ExpirationYear, string CardCVV)
{

try
{

return Name + "," + Email + "," + CardNumber + "," + ExpirationMonth +"," + ExpirationYear + "," + CardCVV;

//Please, Anybody to help with JSON Function to retrieve the Data(values) from the parameters which are above.....// Code Here

}
catch (Exception ex)
{
throw new NotImplementedException(ex.Message );
}
}