If your Google Checkout payments are resulting in this error message after checkout:
We encountered an error trying to access your server at https://www.e-junkie.com/gc/XXXXX/ResponseHandler.php -- the error we got is Send failed with code: 500. Response body was:
Please double-check every step of our Google Checkout integration procedure to confirm you haven't overlooked anything -- especially note our API Callback URL and Callback Contents requirements.
Also bear in mind that our required Google Checkout integration settings will have them attempt to inform our system of every payment you receive through their checkout process; if you are receiving any Google Checkout payments that were not initiated from E-junkie Cart or Buy Now buttons (e.g., if you use the "Send An Invoice" function in your Google Checkout account to request payment manually), then those payments would create this sort of error, as our system would refuse to process an order that was not placed through our system to begin with, so in that case the error is unimportant and can be ignored.