Full SDK (Android)

The Yuno Full SDK for Android provides a complete payment solution with a customizable UI. It offers advanced features like payment method management, fraud prevention, and seamless checkout flows, making it more feature-rich than our Headless SDK, which is specific to core payment processing capabilities.

Requirements

Before starting the Yuno Android SDK, make sure your project meets the technical requirements. In addition, ensure the following prerequisites are in place:

• You must have an active Yuno account
• To perform the integration, you'll need your Yuno API credentials (account_id, public-api-key, and private-secret-key), which you can obtain from the Developers section of the Yuno dashboard. These credentials are required to authenticate requests to the Yuno API. The API is used to:
  • Create a checkout_session, which initializes the payment flow
  • Create the payment associated with the session
• Before creating a payment, you must first create a customer using the Create customer endpoint

Step 1: Include the library in your project

Ensure the Yuno SDK file is included in your project through Gradle. Then, add the repository source using the following code line:

maven { url "https://yunopayments.jfrog.io/artifactory/snapshots-libs-release" }

After, include the code below in the file build.gradle to add the Yuno SDK dependency to the application.

dependencies {
    implementation 'com.yuno.payments:android-sdk:{last_version}'
}

Permissions

Yuno SDK includes, by default, the INTERNET permission, which is required to make network requests.

<uses-permission android:name="android.permission.INTERNET" />

Step 2: Initialize SDK with the public key

First, you must retrieve your public API keys from the Yuno dashboard.

If you haven't implemented a custom application, create one. In the onCreate() method of your application class, call the initialize function (Yuno.initialize) as shown in the example below:

class CustomApplication : Application() {
  override fun onCreate() {
    super.onCreate()
    Yuno.initialize(
      this,
      "<your-public-api-key>",
      config: YunoConfig, // This is a data class to use custom configs in the SDK.
    )
  }
}

Use the data class YunoConfig to customize the SDK's behavior. You can include this configuration when calling Yuno.initialize(). The available options are:

data class YunoConfig(
    val cardFlow: CardFormType = CardFormType.ONE_STEP, // Optional: Defines the card form flow type. ONE_STEP shows a single screen for card details, TWO_STEP splits it across multiple screens.
    val saveCardEnabled: Boolean = false, // Determines whether to display the "Save card" checkbox on card flows.
    val keepLoader: Boolean = false, // If true, keeps the Yuno loading screen visible until payment creation and continuation. Requires an additional step described later.
    val cardFormDeployed: Boolean = false, // Full SDK only: If true, displays the card form within the payment methods list. If false, shows the card form on a separate screen.
    val language: YunoLanguage? = null, // Sets the SDK language. If null or not provided, defaults to the device language.
    val styles: YunoStyles? = null // Enables SDK-wide UI customization.
)

The following table includes descriptions for each customization available.

You also need to update your manifest to use your application:

<application android:name=".CustomApplication"></application>

Step 3: Create the checkout session

Each payment requires a new checkout_session, which provides access to all available payment methods for a specific customer. To obtain a new checkout_session, use the Create checkout session endpoint. This session is then used to initiate the payment.

Step 4: Start the checkout process

To start a new payment process with the Full SDK, call the startCheckout method inside the onCreate() function of the activity that initializes the SDK:

startCheckout(
  checkoutSession: "checkout_session",
  // Replace with your target country's ISO code (e.g., "US" for USA, "FR" for France). The complete list of country_codes is available on https://docs.y.uno/docs/country-coverage-yuno-sdk.
  countryCode: "country_code_iso",
  callbackPaymentState: ((String?) -> Unit)?,
  merchantSessionId: String? = null //Optional - Default null
)

Below is a description of the required parameters to start the checkout.

The possible states returned by the callbackPaymentState are presented below:

const val PAYMENT_STATE_SUCCEEDED = "SUCCEEDED"
const val PAYMENT_STATE_FAIL = "FAIL"
const val PAYMENT_STATE_PROCESSING = "PROCESSING"
const val PAYMENT_STATE_REJECT = "REJECT"
const val PAYMENT_STATE_INTERNAL_ERROR = "INTERNAL_ERROR"
const val PAYMENT_STATE_STATE_CANCELED_BY_USER = "CANCELED"

The following table provide additional information about the possible states:

Step 5: Add the SDK view to the checkout

When implementing the Full SDK, be sure to include the PaymentMethodListView in your layout to display the available payment methods. Additionally, use the .setOnSelectedEvent lambda function to notify your app when to enable or disable the pay button.

<com.yuno.payments.features.payment.ui.views.PaymentMethodListView
  android:id="@+id/list_payment_methods" 
  android:layout_width="match_parent"
	android:layout_height="wrap_content" />

Step 6: Initiate the payment process

To start a payment process, you have to call the method startPayment().

startPayment(
    showStatusYuno: Boolean,  
    callbackOTT: (String?) -> Unit = this::onTokenUpdated,  
    callBackTokenWithInformation: (OneTimeTokenModel?) -> Unit = this::onTokenComplete  
)

Below is a description of the required parameters to start the payment.

Step 7: Get the one-time token (OTT)

Once the customer fills out the requested data in Yuno's payment forms, you will obtain the one-time token, a required parameter to create a payment using the Yuno API.

The one-time token will be shared by Yuno using the callbackOTT function you provided in Step 6 when initiating the payment. The one-time token will be available in the onActivityResult.

Step 8: Create the payment

Once you receive the one-time token from Step 7, you can create the payment using the Create payment endpoint. To create the payment, use the checkout_session from Step 3 and the one-time token.

The response from the Create payment endpoint will include the parameter sdk_action_required, which defines if additional actions are required to finish the payment based on the payment type.

Step 9: Continue payment

Yuno requires integrating the SDK’s continuePayment method after the payment is created, as certain asynchronous payment methods require additional customer actions to complete. The response from the Create payment endpoint, from Step 8, will include a sdk_action_required field. If it returns TRUE, it means you need to call the continuePayment() function to show additional screens that allow the customer to complete the payment. Otherwise, this step is not necessary. You need to call continuePayment method as presented below:

continuePayment(
    showPaymentStatus: Boolean = true, // Optional – Default true
    checkoutSession: String? = null,   // Optional – Default null
    countryCode: String? = null,       // Optional – Default null
    callbackPaymentState: ((String?) -> Unit)? = null // Optional – Default null
)

To show your payment status screens, you should send FALSE in the showPaymentStatus parameter. Then, get the payment state by callback.

Complementary features

Yuno Android SDK provides additional services and configurations you can use to improve customers' experience. Use the SDK customizations to change the SDK appearance to match your brand or to configure the loader.

styles

With the styles customization option, you can define global visual styles like through a YunoStyles object. It lets you apply consistent branding across the SDK by customizing button appearance and typography.

data class YunoStyles(
    val buttonStyles: YunoButtonStyles? = null,
    val fontFamily: FontFamily? = null
)

The YunoButtonStyles object lets you define specific settings for button appearance:

data class YunoButtonStyles(
    val backgroundColor: Color? = null,
    val contentColor: Color? = null,
    val cornerRadius: Dp? = null,
    val elevation: Dp? = null,
    val padding: Dp? = null,
    val fontFamily: FontFamily? = null,
    val fontSize: TextUnit? = null,
    val fontStyle: FontStyle? = null
)

To use the styles customization option, you have to use the YunoConfig data class, described in Step 2.

Loader

The Loader enables you to control the use of the loader component.

Save card for future payments

In addition, you can display a checkbox to save or enroll cards using cardSaveEnable: true. Below, you can find examples of the checkbox for both card form renders:

Render options

You can choose between two card form render options. The following screenshots demonstrate the difference between cardFormType ONE_STEP and STEP_BY_STEP:

SDK customizations

You can change the SDK appearance to match your brand. For more information, access the SDK customizations page.