Android Setup

android {
    defaultConfig {
        minSdkVersion 23       // Required for Keychain & NFC APIs
        // ...
    }
}

dependencies {
    // Required by react-native-keychain v8
    implementation "androidx.datastore:datastore-core:1.0.0"
    implementation "androidx.datastore:datastore-preferences:1.0.0"
    implementation "androidx.datastore:datastore-preferences-core:1.0.0"

    // Fix Kotlin stdlib version conflicts
    configurations.all {
        resolutionStrategy {
            force "org.jetbrains.kotlin:kotlin-stdlib:1.8.0"
            force "org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.8.0"
            force "org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.8.0"
        }
    }
}

buildscript {
    ext {
        kotlinVersion = "1.8.0"
    }
    dependencies {
        classpath("org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlinVersion")
    }
}

<manifest xmlns:android="http://schemas.android.com/apk/res/android">

  <!-- NFC Permissions -->
  <uses-permission android:name="android.permission.NFC" />
  <uses-feature android:name="android.hardware.nfc" android:required="true" />
  <uses-feature android:name="android.hardware.nfc.hce" android:required="true" />

  <application ...>

    <!-- TapRails HCE Service (merchant NFC emulation) -->
    <service
      android:name="com.taprails.hce.TapRailsHCEService"
      android:exported="true"
      android:enabled="true"
      android:permission="android.permission.BIND_NFC_SERVICE">
      <intent-filter>
        <action android:name="android.nfc.cardemulation.action.HOST_APDU_SERVICE" />
        <category android:name="android.intent.category.DEFAULT"/>
      </intent-filter>
      <meta-data
        android:name="android.nfc.cardemulation.host_apdu_service"
        android:resource="@xml/aid_list" />
    </service>

  </application>
</manifest>

<host-apdu-service
  xmlns:android="http://schemas.android.com/apk/res/android"
  android:description="@string/app_name"
  android:requireDeviceUnlock="true">
  <aid-group android:category="other" android:description="@string/app_name">
    <!-- REPLACE WITH YOUR DASHBOARD-ASSIGNED AID -->
    <aid-filter android:name="YOUR_UNIQUE_AID" />
  </aid-group>
</host-apdu-service>