If you are going to have a feature called "Instant Payment Notification" it would be nice if the notification happened, you know, instantly, instead of 14 minutes and 59 seconds later.
How do you expect people to debug their applications if it takes this long for your sandbox to respond?
Also! It would be neat if there would be a way to see a list of all the transactions that were submitted to your sandbox account the same way you display outbound emails.
Kisses,
Jeffrey
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If this was a Yelp review, I’d mark this both “Useful” and “Funny”