How do we know which graph api version we are using from the SDK

I think this can help you, because in this changelog it is written that in which SDK version which GRAPH API version was used.

  • versions >= 5:
  • versions <5:

For iOS, if you are not calling the method named + (void)setGraphAPIVersion:(NSString *)version anywhere in the project, you should be using the version defined with FBSDK_TARGET_PLATFORM_VERSION. You can find it in FBSDKCoreKit.h file as below:

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You can also try to log [FBSDKSettings graphAPIVersion];