Yes, you must. Because those are the rules of Flyertalk.

Seems you're a little less forthcoming there about the relationship (yes, if you scroll right to the bottom and look at the small print on the right-hand side you'll see a barely readable "Brought to you by Sam", so it is there...)

Also when listing ratings on the various app stores it's a good idea to include the number of reviews. 4.5/5 on Google Play for Sam might be less than TripCase's 4.3, but one has over 17 thousand reviews, whilst the other has 26 which changes the impact of those scores a little (plus Sam is down to 4.2 now - I guess the 4.5 was when it only had 24 votes!?)