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-
-# 📑 Advanced APIs
-
-- [Measure App Uninstalls](#uninstall)
-- [User invite](#userInvite)
-- [In-app purchase validation](#iae)
-
----
-
-### <a id="uninstall"> Measure App Uninstalls
-
-#### iOS
-
-#### First method
-
-AppsFlyer enables you to measure app uninstalls. To handle notifications it requires  to modify your `AppDelegate.m`. Use [didRegisterForRemoteNotificationsWithDeviceToken](https://developer.apple.com/reference/uikit/uiapplicationdelegate) to register to the uninstall feature.
-
-*Example:*
-
-```objective-c
-@import AppsFlyerLib;
-
-...
-
-- (void)application:(UIApplication ​*)application didRegisterForRemoteNotificationsWithDeviceToken:(NSData *​)deviceToken {
-// notify AppsFlyerLib
- [[AppsFlyerLib shared] registerUninstall:deviceToken];
-}
-```
-
-Read more about Uninstall register: [Appsflyer SDK support site](https://support.appsflyer.com/hc/en-us/articles/207032066-AppsFlyer-SDK-Integration-iOS)
-
-#### Second method
-
-Pass the device token to AppsFlyer
-
-*Example:*
-
-```javascript
-appsFlyer.updateServerUninstallToken(deviceToken, (success) => {
-  //...
-});
-```
-
-#### <a id="measure-app-uninstalls-android"> Android
-
-Update Firebase device token so it can be sent to AppsFlyer
-
-*Example:*
-
-```javascript
-appsFlyer.updateServerUninstallToken(newFirebaseToken, (success) => {
-  //...
-});
-```
-
-Read more about Android  Uninstall Measurement: [Appsflyer SDK support site](https://support.appsflyer.com/hc/en-us/articles/208004986-Android-Uninstall-Tracking)
-
----
-
-### <a id="userInvite"> User invite
-A complete list of supported parameters is available [here](https://support.appsflyer.com/hc/en-us/articles/115004480866-User-Invite-Tracking). Custom parameters can be passed using a userParams{} nested object, as in the example above.
-
-| parameter       | type     | description                      |
-| ----------      |----------|------------------                |
-| parameters      | json     | parameters for Invite link       |
-| success         | function | success callback (generated link)|
-| error           | function | error callback                   |
-
-
-*Example:*
-
-```javascript
-appsFlyer.generateInviteLink(
- {
-   channel: 'gmail',
-   campaign: 'myCampaign',
-   customerID: '1234',
-   userParams: {
-     myParam: 'newUser',
-     anotherParam: 'fromWeb',
-     amount: 1,
-   },
- },
- (link) => {
-   console.log(link);
- },
- (err) => {
-   console.log(err);
- }
-);
-```
----
-### <a id="iae"> In-app purchase validation
-Receipt validation is a secure mechanism whereby the payment platform (e.g. Apple or Google) validates that an in-app purchase indeed occurred as reported.<br>
-Learn more - https://support.appsflyer.com/hc/en-us/articles/207032106-Receipt-validation-for-in-app-purchases<br>
-❗Important❗ for iOS - set SandBox to ```true```<br>
-```appsFlyer.setUseReceiptValidationSandbox(true);```
-
-
-| parameter       | type     | description                      |
-| ----------      |----------|------------------                |
-| purchaseInfo      | json     | In-App Purchase parameters      |
-| successC         | function | success callback (generated link)|
-| errorC           | function | error callback                   |
-
-
-*Example:*
-
-```javascript
-let info = {
-        publicKey: 'key',
-        currency: 'biz',
-        signature: 'sig',
-        purchaseData: 'data',
-        price: '123',
-        productIdentifier: 'identifier',
-        currency: 'USD',
-        transactionId: '1000000614252747',
-        additionalParameters: {'foo': 'bar'},
-    };
-
-appsFlyer.validateAndLogInAppPurchase(info, res => console.log(res), err => console.log(err));
-```
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