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Android Login Check Response From Json if True Updated FREE

Android Login Check Response From Json if True

An Android App Link is a special type of deep link that allows your website URLs to immediately open the respective content in your Android app, without requiring the user to select the app. Android App Links use the Digital Asset Links API to found trust that your app has been approved by the website to automatically open links for that domain. If the system successfully verifies that you lot own the URLs, the organization automatically routes those URL intents to your app.

To verify that you lot ain both your app and the website URLs, consummate the post-obit steps:

Add intent filters that contain the autoVerify attribute. This aspect signals to the system that it should verify whether your app belongs to the URL domains used in your intent filters.
Declare the association between your website and your intent filters by hosting a Digital Asset Links JSON file at the post-obit location:
```
https://domain.name/.well-known/assetlinks.json
```

You can find related information in the following resources:

Supporting URLs and App Indexing in Android Studio
Creating a Statement List

Add together intent filters for app links verification

To enable link handling verification for your app, add intent filters that match the following format:

          <!-- Brand sure you explicitly ready android:autoVerify to "true". --> <intent-filter android:autoVerify="true">     <action android:name="android.intent.action.VIEW" />     <category android:proper noun="android.intent.category.DEFAULT" />     <category android:name="android.intent.category.BROWSABLE" />      <!-- If a user clicks on a shared link that uses the "http" scheme, your          app should be able to delegate that traffic to "https". -->     <information android:scheme="http" />     <data android:scheme="https" />      <!-- Include one or more domains that should be verified. -->     <information android:host="..." /> </intent-filter>

Although information technology's sufficient to include autoVerify in only ane <intent-filter> declaration for each host, even if that host is used across other unmarked declarations, it'southward recommended that you lot add autoVerify to each <intent-filter> element for consistency. This also ensures that, after your remove or refactor elements in your manifest file, your app remains associated with all the domains that y'all all the same define.

The domain verification process requires an internet connection and could take some fourth dimension to complete. To assist amend the efficiency of the process, the system verifies a domain for an app that targets Android 12 or college simply if that domain is inside an <intent-filter> element that contains the exact format specified in the preceding code snippet.

Supporting app linking for multiple hosts

The system must be able to verify the host specified in the app's URL intent filters' data elements confronting the Digital Asset Links files hosted on the respective spider web domains in that intent filter. If the verification fails, the arrangement then defaults to its standard behavior to resolve the intent, as described in Create Deep Links to App Content. Still, the app tin nevertheless be verified equally a default handler for any of the URL patterns divers in the app's other intent filters.

Note: On Android 11 (API level 30) and lower, the arrangement doesn't verify your app as a default handler unless information technology finds a matching Digital Nugget Links file for all hosts that you lot ascertain in the manifest.

For example, an app with the following intent filters would laissez passer verification only for https://world wide web.example.com if an assetlinks.json file were constitute at https://www.example.com/.well-known/assetlinks.json but not https://www.example.net/.well-known/assetlinks.json:

<application>    <activity android:name="MainActivity">     <intent-filter android:autoVerify="true">       <action android:proper noun="android.intent.activity.VIEW" />       <category android:proper noun="android.intent.category.DEFAULT" />       <category android:proper noun="android.intent.category.BROWSABLE" />          <information android:scheme="http" />       <information android:scheme="https" />       <data android:host="www.example.com" />          </intent-filter>   </activity>   <activity android:proper name="SecondActivity">     <intent-filter>       <action android:name="android.intent.activeness.VIEW" />       <category android:name="android.intent.category.DEFAULT" />       <category android:name="android.intent.category.BROWSABLE" />                      <data android:scheme="https" />      <information android:host="www.example.net" />          </intent-filter>   </activeness>  </application>

Note: All <data> elements in the aforementioned intent filter are merged together to account for all variations of their combined attributes. For example, the beginning intent filter to a higher place includes a <data> element that merely declares the HTTPS scheme. Just it is combined with the other <data> chemical element so that the intent filter supports both http://world wide web.example.com and https://www.example.com. As such, yous must create separate intent filters when you want to define specific combinations of URI schemes and domains.

Supporting app linking for multiple subdomains

The Digital Asset Links protocol treats subdomains in your intent filters as unique, separate hosts. Then if your intent filter lists multiple hosts with different subdomains, you must publish a valid assetlinks.json on each domain. For instance, the post-obit intent filter includes www.instance.com and mobile.example.com every bit accustomed intent URL hosts. So a valid assetlinks.json must be published at both https://www.instance.com/.well-known/assetlinks.json and https://mobile.example.com/.well-known/assetlinks.json.

<application>   <activeness android:name="MainActivity">     <intent-filter android:autoVerify="true">       <action android:name="android.intent.action.VIEW" />       <category android:name="android.intent.category.DEFAULT" />       <category android:name="android.intent.category.BROWSABLE" />          <data android:scheme="https" />       <data android:scheme="https" />       <information android:host="world wide web.example.com" />       <data android:host="mobile.case.com" />          </intent-filter>   </activeness> </application>

Alternatively, if you lot declare your hostname with a wildcard (such as *.example.com), you must publish your assetlinks.json file at the root hostname (example.com). For example, an app with the following intent filter volition pass verification for whatever sub-name of example.com (such as foo.case.com) as long equally the assetlinks.json file is published at https://example.com/.well-known/assetlinks.json:

<application>   <action android:proper name="MainActivity">     <intent-filter android:autoVerify="truthful">       <activity android:name="android.intent.action.VIEW" />       <category android:proper name="android.intent.category.DEFAULT" />       <category android:name="android.intent.category.BROWSABLE" />          <information android:scheme="https" />       <data android:host="*.example.com" />          </intent-filter>   </activity> </application>

Cheque for multiple apps associated with the aforementioned domain

If you lot publish multiple apps that are each associated with the same domain, they can each exist successfully verified. Withal, if the apps can resolve the verbal same domain host and path, as might be the instance with lite and full versions of an app, only the app that was installed most recently can resolve spider web intents for that domain.

In a example like this, check for possible conflicting apps on the user's device, provided that yous accept the necessary bundle visibility. Then, in your app, bear witness a custom chooser dialog that contains the results from calling queryIntentActivities(). The user can select their preferred app from the list of matching apps that appear in the dialog.

Declare website associations

A Digital Asset Links JSON file must exist published on your website to indicate the Android apps that are associated with the website and verify the app's URL intents. The JSON file uses the post-obit fields to identify associated apps:

package_name: The awarding ID declared in the app's build.gradle file.
sha256_cert_fingerprints: The SHA256 fingerprints of your app's signing certificate. Y'all tin can use the following control to generate the fingerprint via the Java keytool:
```
keytool -listing -v -keystore my-release-key.keystore            
```
This field supports multiple fingerprints, which can be used to support different versions of your app, such equally debug and production builds.
If you're using Play App Signing for your app, and then the document fingerprint produced by running keytool locally volition usually not match the one on users' devices. You can verify whether you're using Play App Signing for your app in your Play Console programmer business relationship under Release > Setup > App Integrity; if you do, then you'll as well detect the correct Digital Asset Links JSON snippet for your app on the same folio.

The post-obit example assetlinks.json file grants link-opening rights to a com.example Android app:

[{   "relation": ["delegate_permission/common.handle_all_urls"],   "target": {     "namespace": "android_app",     "package_name": "com.case",     "sha256_cert_fingerprints":     ["14:6D:E9:83:C5:73:06:l:D8:EE:B9:95:2F:34:FC:64:16:A0:83:42:E6:1D:BE:A8:8A:04:96:B2:3F:CF:44:E5"]   } }]

Associating a website with multiple apps

A website can declare associations with multiple apps within the same assetlinks.json file. The following file listing shows an example of a statement file that declares association with 2 apps, separately, and resides at https://world wide web.example.com/.well-known/assetlinks.json:

[{   "relation": ["delegate_permission/common.handle_all_urls"],   "target": {     "namespace": "android_app",     "package_name":          "com.example.puppies.app",     "sha256_cert_fingerprints":     ["14:6D:E9:83:C5:73:06:50:D8:EE:B9:95:2F:34:FC:64:sixteen:A0:83:42:E6:1D:Be:A8:8A:04:96:B2:3F:CF:44:E5"]   }   },   {   "relation": ["delegate_permission/common.handle_all_urls"],   "target": {     "namespace": "android_app",     "package_name": "com.example.monkeys.app",     "sha256_cert_fingerprints":     ["fourteen:6D:E9:83:C5:73:06:50:D8:EE:B9:95:2F:34:FC:64:16:A0:83:42:E6:1D:Be:A8:8A:04:96:B2:3F:CF:44:E5"]   } }]

Different apps may handle links for different resource under the same spider web host. For case, app1 may declare an intent filter for https://case.com/articles, and app2 may declare an intent filter for https://example.com/videos.

Annotation: Multiple apps associated with a domain may be signed with the aforementioned or different certificates.

Associating multiple websites with a single app

Multiple websites tin can declare associations with the same app in their respective assetlinks.json files. The following file listings evidence an example of how to declare the association of example.com and example.internet with app1. The commencement list shows the association of example.com with app1:

https://www.example.com/.well-known/assetlinks.json

[{   "relation": ["delegate_permission/common.handle_all_urls"],   "target": {     "namespace": "android_app",     "package_name": "com.mycompany.app1",     "sha256_cert_fingerprints":     ["14:6D:E9:83:C5:73:06:50:D8:EE:B9:95:2F:34:FC:64:xvi:A0:83:42:E6:1D:BE:A8:8A:04:96:B2:3F:CF:44:E5"]   } }]

The side by side list shows the association of case.net with app1. Only the location where these files are hosted is different (.com and .internet):

https://www.case.cyberspace/.well-known/assetlinks.json

[{   "relation": ["delegate_permission/common.handle_all_urls"],   "target": {     "namespace": "android_app",     "package_name": "com.mycompany.app1",     "sha256_cert_fingerprints":     ["fourteen:6D:E9:83:C5:73:06:50:D8:EE:B9:95:2F:34:FC:64:16:A0:83:42:E6:1D:Exist:A8:8A:04:96:B2:3F:CF:44:E5"]   } }]

Publishing the JSON verification file

You must publish your JSON verification file at the following location:

https://domain.name/.well-known/assetlinks.json

Be sure of the following:

The assetlinks.json file is served with content-type application/json.
The assetlinks.json file must be accessible over an HTTPS connection, regardless of whether your app'south intent filters declare HTTPS as the information scheme.
The assetlinks.json file must be accessible without whatsoever redirects (no 301 or 302 redirects) and be accessible by bots (your robots.txt must let crawling /.well-known/assetlinks.json).
If your app links back up multiple host domains, so you lot must publish the assetlinks.json file on each domain. Run across Supporting app linking for multiple hosts.
Do not publish your app with dev/exam URLs in the manifest file that may non be accessible to the public (such as any that are accessible simply with a VPN). A piece of work-around in such cases is to configure build variants to generate a different manifest file for dev builds.

Android App Links verification

When android:autoVerify="true" is present in at least one of your app'south intent filters, installing your app on a device that runs Android 6.0 (API level 23) or higher causes the organization to automatically verify the hosts associated with the URLs in your app's intent filters. On Android 12 and higher, you tin also invoke the verification process manually to test the verification logic.

Auto verification

The system'due south auto-verification involves the following:

The system inspects all intent filters that include:
- Action: android.intent.activeness.VIEW
- Categories: android.intent.category.BROWSABLE and android.intent.category.DEFAULT
- Data scheme: http or https
For each unique host name found in the above intent filters, Android queries the corresponding websites for the Digital Nugget Links file at https://hostname/.well-known/assetlinks.json.

After you take confirmed the list of websites to associate with your app, and you accept confirmed that the hosted JSON file is valid, install the app on your device. Wait at least 20 seconds for the asynchronous verification process to complete. Employ the following command to check whether the organization verified your app and ready the right link handling policies:

adb trounce am beginning -a android.intent.action.VIEW \     -c android.intent.category.BROWSABLE \     -d "http://domain.name:optional_port"

Transmission verification

Starting in Android 12, y'all tin manually invoke domain verification for an app that's installed on a device. You can perform this process regardless of whether your app targets Android 12.

Constitute an internet connection

To perform domain verification, your test device must be connected to the internet.

Back up the updated domain verification procedure

If your app targets Android 12 or higher, the system uses the updated domain verification process automatically.

Otherwise, you can manually enable the updated verification process. To exercise so, run the post-obit control in a final window:

adb shell am compat enable 175408749          PACKAGE_NAME

Reset the state of Android App Links on a device

Before you lot manually invoke domain verification on a device, you must reset the land of Android App Links on the test device. To do so, run the following command in a terminal window:

adb shell pm set-app-links --package          PACKAGE_NAME          0 all

This command puts the device in the same country that it's in earlier the user chooses default apps for any domains.

Invoke the domain verification procedure

After you reset the state of Android App Links on a device, you can perform the verification itself. To practice so, run the following command in a terminal window:

adb crush pm verify-app-links --re-verify          PACKAGE_NAME

Review the verification results

Afterward allowing some fourth dimension for the verification agent to end its requests, review the verification results. To do and then, run the following control:

adb shell pm get-app-links          PACKAGE_NAME

The output of this command is similar to the following:

com.example.pkg:     ID: 01234567-89ab-cdef-0123-456789abcdef     Signatures: [***]     Domain verification land:       case.com: verified       sub.case.com: legacy_failure       example.net: verified       example.org: 1026

The domains that successfully laissez passer verification have a domain verification land of verified. Any other state indicates that the domain verification couldn't be performed. In particular, a state of none indicates that the verification amanuensis might not have completed the verification process yet.

The following list shows the possible return values that domain verification tin render for a given domain:

none

Nothing has been recorded for this domain. Wait a few more minutes for the verification agent to finish the requests related to domain verification, then invoke the domain verification procedure again.

verified

The domain is successfully verified for the declaring app.

approved

The domain was forcefulness-approved, ordinarily by executing a shell command.

denied

The domain was force-denied, usually by executing a shell command.

migrated

The system preserved the result of a previous procedure that used legacy domain verification.

restored

The domain was canonical afterward the user performed a data restore. It'southward assumed that the domain was previously verified.

legacy_failure

The domain was rejected by a legacy verifier. The specific failure reason is unknown.

system_configured

The domain was approved automatically by the device configuration.

Error code of 1024 or greater

Custom error code that's specific to the device'southward verifier.

Double-bank check that you have established a network connection, and invoke the domain verification process again.

Request the user to acquaintance your app with a domain

Some other way for your app to get approved for a domain is to ask the user to associate your app with that domain.

Check whether your app is already approved for the domain

Before y'all prompt the user, cheque whether your app is the default handler for the domains that you lot define in your <intent-filter> elements. You tin can query the approval state using one of the following methods:

The DomainVerificationManager API (at runtime).
A command-line programme (during testing).

DomainVerificationManager

The following code snippet demonstrates how to apply the DomainVerificationManager API:

Kotlin

val context: Context = TODO("Your activity or fragment's Context") val manager = context.getSystemService(DomainVerificationManager::course.java) val userState = manager.getDomainVerificationUserState(context.packageName)  // Domains that have passed Android App Links verification. val verifiedDomains = userState?.hostToStateMap     ?.filterValues { it == DomainVerificationUserState.DOMAIN_STATE_VERIFIED }  // Domains that haven't passed Android App Links verification only that the user // has associated with an app. val selectedDomains = userState?.hostToStateMap     ?.filterValues { it == DomainVerificationUserState.DOMAIN_STATE_SELECTED }  // All other domains. val unapprovedDomains = userState?.hostToStateMap     ?.filterValues { information technology == DomainVerificationUserState.DOMAIN_STATE_NONE }

Java

Context context = TODO("Your action or fragment's Context"); DomainVerificationManager director =         context.getSystemService(DomainVerificationManager.class); DomainVerificationUserState userState =         manager.getDomainVerificationUserState(context.getPackageName());  Map<String, Integer> hostToStateMap = userState.getHostToStateMap(); List<String> verifiedDomains = new ArrayList<>(); List<Cord> selectedDomains = new ArrayList<>(); Listing<String> unapprovedDomains = new ArrayList<>(); for (String central : hostToStateMap.keySet()) {     Integer stateValue = hostToStateMap.go(key);     if (stateValue == DomainVerificationUserState.DOMAIN_STATE_VERIFIED) {         // Domain has passed Android App Links verification.         verifiedDomains.add(key);     } else if (stateValue == DomainVerificationUserState.DOMAIN_STATE_SELECTED) {         // Domain hasn't passed Android App Links verification, but the user has         // associated it with an app.         selectedDomains.add together(key);     } else {         // All other domains.         unapprovedDomains.add(key);     } }

Command-line program

When testing your app during development, you lot tin can run the following command to query the verification state of the domains that your organization owns:

adb crush pm get-app-links --user cur          PACKAGE_NAME

In the following case output, even though the app failed verification for the "example.org" domain, user 0 has manually approved the app in system settings, and no other package is verified for that domain.

com.case.pkg: ID: *** Signatures: [***] Domain verification land:   case.com: verified   example.net: verified   example.org: 1026 User 0:   Verification link treatment allowed: true   Pick land:     Enabled:       example.org     Disabled:       instance.com       example.internet

You can also use beat commands to simulate the procedure where the user selects which app is associated with a given domain. A full explanation of these commands is bachelor from the output of adb shell pm.

Provide context for the request

Before y'all make this request for domain approval, provide some context for the user. For example, you might bear witness them a splash screen, a dialog, or a similar UI chemical element that explains to the user why your app should be the default handler for a particular domain.

Brand the asking

Subsequently the user understands what your app is request them to do, brand the request. To do and then, invoke an intent that includes the ACTION_APP_OPEN_BY_DEFAULT_SETTINGS intent action, and a information cord matching bundle:com.example.pkg for the target app, as shown in the following code snippet:

Kotlin

val context: Context = TODO("Your activity or fragment's Context") val intent = Intent(Settings.ACTION_APP_OPEN_BY_DEFAULT_SETTINGS,     Uri.parse("packet:${context.packageName}")) context.startActivity(intent)

Coffee

Context context = TODO("Your activeness or fragment's Context"); Intent intent = new Intent(Settings.ACTION_APP_OPEN_BY_DEFAULT_SETTINGS,     Uri.parse("package:" + context.getPackageName())); context.startActivity(intent);

When the intent is invoked, users come across a settings screen called Open by default. This screen contains a radio button chosen Open up supported links, equally shown in figure ane.

When the user turns on Open up supported links, a set of checkboxes appear under a department called Links to open in this app. From here, users can select the domains that they desire to associate with your app. They can also select Add link to add domains, as shown in effigy two. When users subsequently select whatsoever link inside the domains that they add together, the link opens in your app automatically.

Figure 1. Organization settings screen where users can choose which links open up in your app by default.

Each checkbox represents a domain that you can add. The dialog's buttons are 'Cancel' and 'Add.'

Figure ii. Dialog where users can choose additional domains to associate with your app.

Open domains in your app that your app cannot verify

Your app's main function might be to open up links equally a third party, without the power to verify its handled domains. If this is the case, explicate to users that, at that time when they select a web link, they cannot choose between a outset-political party app and your (3rd-party) app. Users need to manually associate the domains with your third-party app.

In addition, consider introducing a dialog or trampoline action that allows the user to open the link in the get-go-party app if the user prefers to do and then, acting equally a proxy. Before setting upwardly such a dialog or trampoline activity, prepare up your app so that information technology has parcel visibility into the commencement-party apps that match your app's spider web intent filter.

Exam app links

When implementing the app linking feature, yous should exam the linking functionality to brand certain the organisation can acquaintance your app with your websites, and handle URL requests, as yous expect.

To test an existing statement file, you can use the Statement List Generator and Tester tool.

Confirm the list of hosts to verify

When testing, y'all should confirm the list of associated hosts that the system should verify for your app. Make a list of all URLs whose corresponding intent filters include the following attributes and elements:

android:scheme attribute with a value of http or https
android:host attribute with a domain URL pattern
android.intent.action.VIEW action element
android.intent.category.BROWSABLE category element

Employ this list to check that a Digital Nugget Links JSON file is provided on each named host and subdomain.

Ostend the Digital Nugget Links files

For each website, utilise the Digital Nugget Links API to confirm that the Digital Asset Links JSON file is properly hosted and defined:

https://digitalassetlinks.googleapis.com/v1/statements:list?    source.web.site=https://domain.proper name:optional_port&    relation=delegate_permission/common.handle_all_urls

Check link policies

As role of your testing process, you can check the current system settings for link handling. Use the post-obit control to go a listing of existing link-handling policies for all apps on your continued device:

adb shell dumpsys package domain-preferred-apps

Or the post-obit does the aforementioned matter:

adb vanquish dumpsys parcel d

Notation: Brand sure you lot wait at least xx seconds after installation of your app to allow for the system to complete the verification process.

The command returns a listing of each user or profile defined on the device, preceded by a header in the following format:

App linkages for user 0:

Following this header, the output uses the following format to list the link-handling settings for that user:

Package: com.android.vending Domains: play.google.com market.android.com Status: always : 200000002

This listing indicates which apps are associated with which domains for that user:

Package - Identifies an app past its package name, as declared in its manifest.
Domains - Shows the full listing of hosts whose spider web links this app handles, using blank spaces as delimiters.
Status - Shows the current link-handling setting for this app. An app that has passed verification, and whose manifest contains android:autoVerify="true", shows a status of always. The hexadecimal number later on this status is related to the Android organisation'southward record of the user's app linkage preferences. This value does not indicate whether verification succeeded.

Note: If a user changes the app link settings for an app earlier verification is complete, you may run across a false positive for a successful verification, even though verification has failed. This verification failure, however, does not thing if the user explicitly enabled the app to open up supported links without asking. This is because user preferences take precedence over programmatic verification (or lack of it). Every bit a outcome, the link goes direct to your app, without showing a dialog, simply as if verification had succeeded.

Examination case

For app link verification to succeed, the system must be able to verify your app with each of the websites that you specify in a given intent filter that meets the criteria for app links. The post-obit example shows a manifest configuration with several app links defined:

<application>      <activity android:proper noun="MainActivity">         <intent-filter android:autoVerify="true">             <action android:name="android.intent.action.VIEW" />             <category android:name="android.intent.category.DEFAULT" />             <category android:name="android.intent.category.BROWSABLE" />             <data android:scheme="https" />             <information android:scheme="https" />             <data android:host="world wide web.example.com" />             <data android:host="mobile.case.com" />         </intent-filter>         <intent-filter>             <action android:name="android.intent.action.VIEW" />             <category android:name="android.intent.category.BROWSABLE" />             <data android:scheme="https" />             <data android:host="www.example2.com" />         </intent-filter>     </activeness>      <action android:proper noun="SecondActivity">         <intent-filter>             <action android:name="android.intent.activeness.VIEW" />             <category android:name="android.intent.category.DEFAULT" />             <category android:proper name="android.intent.category.BROWSABLE" />             <data android:scheme="https" />             <data android:host="account.case.com" />         </intent-filter>     </activity>        <activity android:proper name="ThirdActivity">         <intent-filter>             <activity android:name="android.intent.action.VIEW" />             <category android:name="android.intent.category.DEFAULT" />             <data android:scheme="https" />             <data android:host="map.instance.com" />         </intent-filter>         <intent-filter>             <activeness android:name="android.intent.activity.VIEW" />             <category android:name="android.intent.category.BROWSABLE" />             <data android:scheme="market" />             <information android:host="case.com" />         </intent-filter>       </activity>  </application>

The list of hosts that the platform would attempt to verify from the above manifest is:

www.example.com mobile.case.com www.example2.com account.case.com

The list of hosts that the platform would not attempt to verify from the in a higher place manifest is:

map.case.com (it does not have android.intent.category.BROWSABLE) market://example.com (it does non accept either an "http" or "https" scheme)

To learn more than near statement lists, meet Creating a Statement List.

Fix common implementation errors

If y'all tin't verify your Android App Links, check for the following common errors. This department uses instance.com as a placeholder domain proper name; when performing these checks, substitute instance.com with your server's actual domain name.

Incorrect intent filter gear up up

Check to see whether y'all include a URL that your app doesn't own in an <intent-filter> element.

Wrong server configuration

Check to your server's JSON configuration, and make sure the SHA value is right.

Also, bank check that example.com. (with the abaft period) serves the same content as example.com.

Server-side redirects

The arrangement doesn't verify any Android App Links for your app if you lot set a redirect such as the post-obit:

http://example.com to https://case.com
example.com to www.case.com

This behavior protects your app'due south security.

Server robustness

Check whether your server can connect to your customer apps.

Non-verifiable links

For testing purposes, you might intentionally add non-verifiable links. Keep in mind that, on Android 11 and lower, these links cause the arrangement to not verify all Android App Links for your app.

Incorrect signature in assetlinks.json

Verify that your signature is correct and matches the signature used to sign your app. Common mistakes include:

Signing the app with a debug certificate and only having the release signature in assetlinks.json.
Having a lower case signature in assetlinks.json. The signature should be in upper case.
If yous are using Play App Signing, make certain you lot're using the signature that Google uses to sign each of your releases. You tin can verify these details, including a consummate JSON snippet, by following instructions about declaring website associations.