Hi, I downloaded the sample application source code for android given on the website. I am able to proceed through initialising the sdk, uploading photos and searching Walgreens location. But after selecting one of the location and filling the info (i.e, name, phone, email) on "Order Prints" screen, I am unable to proceed further as I am getting this error: "We're sorry, there was an error with your checkout. Please try again." Is this an issue with Walgreens server or have I left out on something? Kindly help, Thanks.