Making a Retrofit API call with RxJava

Api.kt

authApi.getTokens()
  .subscribe({ response: Response<AccessToken> ->
    when {
      response.isSuccessful && response.body() != null -> {
        // Case 1: Success. We got a response with a body.
      }
      response.errorBody() != null -> {
        // Case 2: Failure. We got an error from the backend, deserialize it.
        val error = moshi.adapter(Error::class.java).fromJson(errorBody.source())
      }
      else -> {
        // Case 3: Failure. Response didn't have a body. Show a vanilla error.
      }
    }
  }, { t ->
    // Case 4: Failure. Network error occurred, notify the user of connection troubles.
  })