[YMMV] $15 Amazon promo code for placing order in-app, additional $15 promo after using first $30

Received an email today from Amazon. $15 off offer for items shipped and sold by Amazon when placing the order in-app. After placing an order, come back to receive your second.
Email subject line: "Get $30 to shop in the app"
https://smile.amazon.com/gp/r.htm…amazon.com