This is a very cool deal and I just bought it, but please be careful when redeeming the twilio promo code.<p>You must purchase $20 of twilio credit, but if you get the promo code wrong, it will charge your card and tell you that the code wasn't found. There is no way to enter the code without paying again. I put in a helpdesk ticket about the issue.<p>The problem for me was that the appsumo page is really cluttered and disorganized. There are two columns, one named "Product" and the other one is named "Code", but there are some rows that encompass both columns which make them seem like dividers and it isn't clear what the text in those columns are supposed to be associated with. Anyway, there is one "divider" line a few lines above Twilio that says "Promo code is XXXXX" and I assumed that was the code for all of the products below it, without realizing that there was a "code" column. Yes, it's my fault for jumping the gun, but in my defense, that page is pretty bad.