My deal started around 11am EST and ran for approximately 12 hours. Now I see that they've upped the time a bit and start way earlier. Soon after my shop was featured I started to get sales. You have to choose 'other' in your shipping options to be able to accept the Heartsy certificates. The customers should put the certificate # as well as the amount. If the customer went over their certificate amount ($50 in my case) I invoiced them via PayPal using the email address in their Etsy account. Most people should pay you immediately; I think only one person took a few days to get payment to me.
After your deal is completely over, Heartsy will send the entire amount of money for the number of certificates you sold to your PayPal account. *Remember, you will incur fees here too!*
I actually used a spreadsheet to help me organize everything. I kept track of what each person bought, certificate #, fees paid, how much was due, etc. ((If you'd like to download the spreadsheet, click here)) It helped me see how much I was dishing out as well as what came in. Also, it was much easier to see who owed me money (after the certificate cost) so I could invoice them and I eventually could extrapolate the data to break down into statistics.
MY Statistics (via Google Analytics):
852 total visits
783 unique visits
5148 page views
6.04 avg. page views
3:15 avg. time on site
23.83% bounce rate
15.96% new visits
MY Monetary Statistics:
Average amount OVER certificate amount: $6.31 (not really that good imo)
Certificates sold: 25(x$20) = $500 immediately sent to my PayPal account
Etsy Fees: -$41
PayPal Fees: -$23
Shipping: -$69 (and most of my items are quite light! If your items are heavier, this will be much higher!)
Total Costs: -$132
I don't know how many potential customers I may get in the future because of their purchases via Heartsy or even Recently Sold Items on Time Machine 2.
Part 3 - My personal thoughts on Heartsy, who I think would do best and how to price your deal.