Hey Rusty,

I am at the final stages of the checkout and I am having a problem at the AuthorizePayment part. The error states:

System.ArgumentOutOfRangeException: StartIndex cannot be less than zero.

This error occurs at this line:

var attempt = preparation.AuthorizePayment(paymentGatewayMethod.PaymentMethod.Key);

Here is a snippet of the code:

var paymentGatewayMethod = MerchelloContext.Current.Gateways.Payment.GetPaymentGatewayMethods().FirstOrDefault();
if (paymentGatewayMethod != null)
{
                            //Save
                            preparation.SavePaymentMethod(paymentGatewayMethod.PaymentMethod);

                            var attempt = preparation.AuthorizePayment(paymentGatewayMethod.PaymentMethod.Key); //CUTS OUT HERE

                            if (attempt.Payment.Success)
                            {

                            }
                            else
                            {

                            }
                        }                    
                    }

When I debug the code, it is definitely getting the Stripe Payment Provider that I am retrieving.

I cannot find any similar error online. Any idea how this could happen? I obviously know what the out of bounds error is but I'm just wondering how it can happen on that line. It doesn't look like there's an array present.

Also what exactly does AuthorizePayment do? What is AuthorizeCapturePayment?

Any help at all would be great!!

Thanks in advance!