ECOMMERCE_PURCHASE event is deprecated in favor of PURCHASE event

[bmamone]

Issue

According to Firebase docs, ECOMMERCE_PURCHASE event is deprecated and PURCHASE should be used instead, but it's not implemented in the analytics library.

This enables the user to log relevant parameters like items and should be updated before deprecation.

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Project Files

Javascript

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#### `package.json`: ```json # N/A ``` #### `firebase.json` for react-native-firebase v6: ```json # N/A ```

iOS

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#### `ios/Podfile`: - [ ] I'm not using Pods - [x] I'm using Pods and my Podfile looks like: ```ruby # N/A ``` #### `AppDelegate.m`: ```objc // N/A ```

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Android

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#### Have you converted to AndroidX? - [x] my application is an AndroidX application? - [x] I am using `android/gradle.settings` `jetifier=true` for Android compatibility? - [x] I am using the NPM package `jetifier` for react-native compatibility? #### `android/build.gradle`: ```groovy // N/A ``` #### `android/app/build.gradle`: ```groovy // N/A ``` #### `android/settings.gradle`: ```groovy // N/A ``` #### `MainApplication.java`: ```java // N/A ``` #### `AndroidManifest.xml`: ```xml ```

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Environment

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**`react-native info` output:** ``` OUTPUT GOES HERE ``` - **Platform that you're experiencing the issue on**: - [ ] iOS - [ ] Android - [ ] **iOS** but have not tested behavior on Android - [x] **Android** but have not tested behavior on iOS - [ ] Both - **`react-native-firebase` version you're using that has this issue:** - 7.0.1 - **`Firebase` module(s) you're using that has the issue:** - Analytics - **Are you using `TypeScript`?** - No

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[Salakar]

PR is in progress: https://github.com/invertase/react-native-firebase/pull/3385

This is also a duplicate of #3512 - closing as we're tracking there, thanks.