feat(SUB-1060): setup Kotlin Checkout SDK (#1)

* (SUB-1060) Initial setup

* (SUB-1060) Update settings.gradle.kts

* (SUB-1060) Update readme docs

.gitignore

@@ -0,0 +1,30 @@
+# Gradle files
+.gradle/
+build/
+
+# Local configuration file (sdk path, etc)
+local.properties
+
+# Log/OS Files
+*.log
+
+# Android Studio generated files and folders
+captures/
+.externalNativeBuild/
+.cxx/
+*.apk
+output.json
+
+# IntelliJ
+*.iml
+.idea/
+
+# Keystore files
+*.jks
+*.keystore
+
+# Google Services (e.g. APIs or Firebase)
+google-services.json
+
+# Android Profiling
+*.hprof

README.md

@@ -1 +1,36 @@
-# reepay-checkout-demo-app-android-kotlin
+# billwerk-checkout-sdk-test
+
+This demo app demonstrates how to build a checkout flow using CheckoutSheet, an embeddable component that currently supports card payments with a single integration
+
+## Getting Started
+
+### Option 1: Load CheckoutSheet dependency through Jitpack
+
+Request a personal access token (`JITPACK_SECRET`) to Billwerk's Jitpack and store it as an environment variable
+
+Make sure the `dependencyResolutionManagement` code block is uncommented in `settings.gradle.kts` 
+
+Uncomment the dependency in `build.gradle.kts`:
+
+```
+implementation("com.github.reepay:reepay-checkout-demo-app-android-kotlin:TAG")
+```
+
+Run the project
+
+### Option 2: Load CheckoutSheet manually
+
+Clone https://github.com/reepay/reepay-android-checkout-sheet to your computer
+
+Copy the absolute path to the repository
+
+In `settings.gradle.kts`, uncomment the lines and insert the correct path to the repository:
+```
+include(":checkout")
+project(":checkout").projectDir = file("/PATH/TO/reepay-android-checkout-sheet/checkout")
+```
+
+Uncomment the dependency in `build.gradle.kts`
+```
+implementation(project(":checkout"))
+```

ReepayCheckoutSheetDemo/.gitignore

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+/build

ReepayCheckoutSheetDemo/build.gradle.kts

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+plugins {
+    id("com.android.application")
+    id("org.jetbrains.kotlin.android")
+}
+
+android {
+    namespace = "com.billwerk.checkoutsheetdemo"
+    compileSdk = 34
+
+    defaultConfig {
+        applicationId = "com.billwerk.checkoutsheetdemo"
+        minSdk = 26
+        targetSdk = 34
+        versionCode = 1
+        versionName = "1.0"
+
+        testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
+    }
+
+    buildTypes {
+        release {
+            isMinifyEnabled = false
+            proguardFiles(
+                getDefaultProguardFile("proguard-android-optimize.txt"),
+                "proguard-rules.pro"
+            )
+        }
+    }
+    compileOptions {
+        sourceCompatibility = JavaVersion.VERSION_1_8
+        targetCompatibility = JavaVersion.VERSION_1_8
+    }
+    kotlinOptions {
+        jvmTarget = "1.8"
+    }
+}
+
+dependencies {
+    implementation("androidx.core:core-ktx:1.12.0")
+    implementation("androidx.appcompat:appcompat:1.6.1")
+
+    // Option 1. implement external dependency
+    //implementation("com.github.reepay:reepay-checkout-demo-app-android-kotlin:TAG")
+
+    // Option 2. Implement local depenency
+    //implementation(project(":checkout"))
+
+    implementation("com.google.android.material:material:1.11.0")
+    implementation("androidx.constraintlayout:constraintlayout:2.1.4")
+    implementation("androidx.lifecycle:lifecycle-runtime-ktx:2.7.0")
+    testImplementation("junit:junit:4.13.2")
+    androidTestImplementation("androidx.test.ext:junit:1.1.5")
+    androidTestImplementation("androidx.test.espresso:espresso-core:3.5.1")
+}

ReepayCheckoutSheetDemo/proguard-rules.pro

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+# Add project specific ProGuard rules here.
+# You can control the set of applied configuration files using the
+# proguardFiles setting in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+#   public *;
+#}
+
+# Uncomment this to preserve the line number information for
+# debugging stack traces.
+#-keepattributes SourceFile,LineNumberTable
+
+# If you keep the line number information, uncomment this to
+# hide the original source file name.
+#-renamesourcefileattribute SourceFile

ReepayCheckoutSheetDemo/src/main/AndroidManifest.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools">
+
+    <uses-permission android:name="android.permission.INTERNET" />
+
+    <application
+        android:allowBackup="true"
+        android:dataExtractionRules="@xml/data_extraction_rules"
+        android:fullBackupContent="@xml/backup_rules"
+        android:icon="@mipmap/ic_launcher"
+        android:label="@string/app_name"
+        android:roundIcon="@mipmap/ic_launcher_round"
+        android:supportsRtl="true"
+        android:theme="@style/Theme.ReepayCheckoutKotlinDemoApp"
+        tools:targetApi="31">
+        <activity
+            android:name=".MainActivity"
+            android:exported="true">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+    </application>
+
+</manifest>

ReepayCheckoutSheetDemo/src/main/java/com/billwerk/checkoutsheetdemo/MainActivity.kt

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+package com.billwerk.checkoutsheetdemo
+
+import android.os.Bundle
+import android.util.Log
+import android.widget.Button
+import androidx.appcompat.app.AppCompatActivity
+import androidx.lifecycle.Lifecycle
+import androidx.lifecycle.lifecycleScope
+import androidx.lifecycle.repeatOnLifecycle
+import com.billwerk.checkout.CheckoutEvent
+import com.billwerk.checkout.CheckoutSheet
+import com.billwerk.checkout.CheckoutSheetConfig
+import com.billwerk.checkout.SheetStyle
+import kotlinx.coroutines.launch
+
+class MainActivity : AppCompatActivity() {
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setContentView(R.layout.activity_main)
+
+        val payButton: Button = findViewById(R.id.pay_button)
+
+        // Initialize Checkout Sheet
+        val checkoutSheet = CheckoutSheet(this)
+
+        // Example configuration
+        val config = CheckoutSheetConfig(
+            sessionId = "",
+            acceptURL = "", // Has to be identical to the one defined in the checkout session
+            cancelURL = "",
+            sheetStyle = SheetStyle.FULL_SCREEN,
+            dismissible = true
+        )
+
+        // Open checkout sheet
+        payButton.setOnClickListener {
+            checkoutSheet.open(config)
+        }
+
+        // Subscribe to events
+        listenForEvents()
+
+    }
+
+    private fun listenForEvents() {
+        lifecycleScope.launch {
+            repeatOnLifecycle(Lifecycle.State.STARTED) {
+                CheckoutEvent.events.collect { eventType ->
+                    Log.d("MyApp", "Collected event ${eventType}")
+                }
+            }
+        }
+    }
+}