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Android SDK

Documentation of Khalti checkout for android


Add the following line to dependency section in build.gradle file

compile 'com.khalti:khalti-android:1.2.5'

It is recommended that you update your support libraries to the latest version. However, if you're unable to update the libraries add the following line instead.

compile ('com.khalti:khalti-android:1.2.5') {
        transitive = true

Note : We recommend you to use the latest version of Build tools and Support libraries for maximum compatibility.

In order to build and run this project, please use Android Studio 3 and please note that the minimum Build tools and Support libraries version should be 27.

compileSdkVersion 27
buildToolsVersion '27.0.3'

compile ''

In order to add support library 27, add the Google's maven url in build.gradle

repositories {
        maven { url "" }

Important Add the lines below in android default config of 'build.gradle'

renderscriptTargetApi 20
renderscriptSupportModeEnabled true



You can add KhaltiButton to your xml layout


And, Locate your xml Khalti Button in your Java

KhaltiButton khaltiButton = (KhaltiButton) findViewById(;

Or, use it in Java

KhaltiButton khaltiButton = new KhaltiButton();

And, add this java KhaltiButton into your layout container.


Configure Khalti Checkout by passing an instance of Config class

When instantiating Config class pass public key, product id, product name, product web url, amount (in paisa) and a new instance of OnCheckOutListener.

Config config = new Config("Public Key", "Product ID", "Product Name", "Product Url", amount, new OnCheckOutListener() {

            public void onSuccess(HashMap<String, Object> data) {
                Log.i("Payment confirmed", data+"");

            public void onError(String action, String message) {
                Log.i(action, message);

Additionally, Config class also accepts a HashMap parameter which you can use to pass any additional data. Make sure you add a merchant_ prefix in your map key.

HashMap<String, String> map = new HashMap<>();
        map.put("merchant_extra", "This is extra data");

        Config config = new Config("Public Key", "Product ID", "Product Name", "Product Url", amount, map, new OnCheckOutListener() {

            public void onSuccess(HashMap<String, Object> data) {
                Log.i("Payment confirmed", data);

            public void onError(String action, String message) {
                Log.i(action, message);


Constraint Parameter Type Description
Required Public key String Test or live public key which identifies the merchant
Required Product identity String Unique product identifier at merchant
Required Product name String Name of product
Optional Product url String URL of product
Required Amount (In PAISA) Long Amount to pay in PAISA. Minimum transaction amount is 1000 PAISA i.e. Rs 10
For non Kyc Verified merchant, the maximum transaction amount limit is 100000 PAISA i.e. Rs 1000
Optional Mobile String Mobile number to be preset in mobile fields
Optional Additional data HashMap Any additional data the merchant wishes to pass to the SDK
Required OnCheckOutListener interface Java interface with 2 callback methods onSuccess & onError. For more information see Callback Methods

Note : In order to preset mobile number, you can also use config.setMobile().

Available Config Preset Methods

Constraint Method Description
Optional setMobile() Preset mobile number

Set Config

Finally set your config in your KhaltiButton.



XML Attribute

Attribute Description
khalti:text Text to display
khalti:button_style Set the style of KhaltiButton from 2 options

Public Methods

Constraint Method Description
Required setCheckOutConfig(Config config) Set configuration required by Khalti checkout
Optional setText(String text) Set text to display in KhaltiButton
Optional setCustomView(View view) Replace KhaltiButton's default view with your custom view
Optional setButtonStyle(ButtonStyle buttonStyle) Select between 2 options to set KhaltiButton's style
Optional showCheckOut() Use this method to show Khalti checkout UI
Optional destroyCheckOut() Use this method to close Khalti checkout UI

Callback Methods

Method Description
onSuccess(HashMap data) This method is called when a transaction has been completed and confirmed by the user. A map containing an access token, required to verify the transaction and data passed through Config instance is returned. Once this method is called, use the access token to verify the transaction. Please follow the verification process for further instructions.
onError(String action, String message) This method is called when an error occurs during payment initiation and confirmation. Action and message value is passed where action defines, the current action being performed and message defines the error.
Response Sample
Success Messsage
Key Value Type
mobile 98XXXXXXXX String
product_name Product Name String
product_identity Product Id String
product_url Product Url String
amount 100 Long
token token String

The success message also contains all the key and value provide as extra data while initiating Config

Error Messsage
Variable Description Type
action Action performed - initiate, confirm String
message Detail Error Message String

More Implementations

Method 1: With Custom Click Listener

Initialize the KhaltiCheckout Object

KhaltiCheckOut khaltiCheckOut = new KhaltiCheckOut(this, config);

Use to display khalti widget

khaltiButton.setOnClickListener(new View.OnClickListener() {
            public void onClick(View view) {
Method 2: With Custom View

Get your custom view

View view = LayoutInflater.from(this).inflate(R.layout.custom_khalti_button, container, false);

Set custom view to your khalti button


Check out the source for Khalti checkout on Github.

Check out the Verification process.