>...they were entering manually Definitely wouldn't discount that possibility. Unrelated to CC processing, but we used a service that gave us a device ID on si

>...they were entering manually Definitely wouldn't discount that possibility. Unrelated to CC processing, but we used a service that gave us a device ID on signups to detect people signing up multiple times (a tipoff that fraud was likely to come). We later found fraudsters were using Amazon's Mechanical Turk to get real people to register manually, thus getting around our device detection.