There are 4 endings if I'm not mistaken.

4 !?? Well well. I need to play this game more !!!

i know i'm late but i'd say 3 endings... or 3.5... (cmiiw just in case i load my save file wrong haha)

1. Bad end 1 (Accuse murderer. Shooting Salma or not just differs very little. this is where i count it as 1 or 1.5 endings haha i just don't really see time wasted to see both in full scene that worth it)
- Scene difference: whether Salma walks away in the distance or she died mid walking away from you in the distance
- Where if you shoot Salma, you can pick "i'm sorry i had to shoot your body" as your last line to Sara
- And if you don't shoot Salma, you can pick "the killer got away in your body" as your last line to Sara.
- Beach scene: Anguish
- The ending credit voicemail is the same whether you shot Salma or not

2. Bad end 2 (Accuse Green, and shoot Salma.)
- Different dialogue and last view with Salma from Bad end 1, as she dies next to you.
- The very last dialogue you can pick for Sara is "i took the killer out"
- Beach scene: Anguish
- The ending credit voicemail is different than Bad end 1

3. Good end (Accuse Green, throw away your weapon in front of Salma)
- Very different outcome from other endings, from the last critical choice until the ending credit's voicemail