A good user interface design stays out of your way. I've worked at eCommerce, Financial, Dating, and Social network companies, always striving for a clean, usable, and hopefully invisible design.
AXS Flash Seats SDK
We extended our ticketing SDK to be able to embed Flash Seats tickets into partner apps. Below are wireframes from the prototype and an early implementation from the Detroit Lions.

Mobile Prototypes
(Created with Sketch & Marvel)

Wireframes Product Page Landing Page iPad App
Green Dot iPad App
eHarmony iPad & iPhone App Designs