I have read the documentation on FBSDK, and for event integration Full code
import { AppEventsLogger } from "react-native-fbsdk";
// Log a $15 purchase.
AppEventsLogger.logPurchase(15, "USD", { param: "value" });
which part it is placed, where it is placed on onPress or how
// Log a $ 15 purchase.
AppEventsLogger.logPurchase (15, "USD", {param: "value"});
Maybe it can provide examples or url links for this solution