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Mercado Pago via Widget

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Prerequisites#

Before implementing Mercado Pago Wallet payments, ensure you have:

  1. Enabled Mercado Pago in the DEUNA Admin Panel.
  2. A generated order token.
  3. Integrated the DEUNA SDK in your project.
  4. Reviewed the Payment Widget documentation for your platform.

Payment Method configuration#

Display the Payment Widget by passing the Mercado Pago configuration in the paymentMethods parameter.

JSON
[
    {
        "paymentMethod": "wallet",
        "processors": [ "mercadopago_wallet" ]
    }
]

Payment Widget - Web#

JavaScript
DeunaSDK.initPaymentWidget({
  orderToken: 'YOUR_ORDER_TOKEN',
  paymentMethods: [
    {
      paymentMethod: 'wallet',
      processors: ['mercadopago_wallet'],
    },
  ],
  callbacks: { ... },
});


Payment Widget - iOS#

Modal (PageSheet)Swift
deunaSDK.initPaymentWidget(
    orderToken: "<DEUNA_ORDER_TOKEN>",
    callbacks: PaymentWidgetCallbacks(
        onSuccess: { order in
            // Close the DEUNA widget
            self.deunaSDK.close {
                // Handle successful payment:
                // - Navigate to confirmation screen
                // - Show success message
                // - Update order status
            }
        },
        onError: { error in                
            if error.type == .paymentError {
                // Handle payment errors:
                // - Show error message
                // - Allow retry
                // - Log analytics
            }
        }
    ),
    paymentMethods: [
        [
            "paymentMethod": "wallet",
            "processors": ["mercadopago_wallet"]
        ]
    ]
)
Embedded (Swift UI)Swift
import DeunaSDK
import SwiftUI

struct PaymentView: View {
    let deunaSDK: DeunaSDK
    
    var body: some View {
        VStack {
            DeunaWidget(
                deunaSDK: deunaSDK,
                configuration: PaymentWidgetConfiguration(
                    orderToken: "YOUR_ORDER_TOKEN",
                    callbacks: PaymentWidgetCallbacks(
                        onSuccess: { order in
                            deunaSDK.dispose {
                                // Handle post-payment flow
                            }
                        },
                        onError: { error in
                            if error.type == .paymentError {
                                // Implement error handling
                            }        
                        }
                    ),
                    paymentMethods: [
                        [
                            "paymentMethod": "wallet",
                            "processors": ["mercadopago_wallet"]
                        ]
                    ]
                )
            )
        }
    }
}


Payment Widget - Android#

For security reasons, Mercado Pago requires that their payment URLs must be loaded in a Custom Tab instead of a WebView.

It's crucial to understand that while a Custom Tab is open, you should avoid updating your UI or performing actions like navigation or showing dialogs. These operations could cause unexpected behavior, including app crashes.

Therefore, you should only execute such actions after the user has closed the Custom Tab. To detect when the Custom Tab closes, implement the following code in your MainActivity:

Kotlin
class MainActivity: AppCompatActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)

        /**
        * Register for activity result callbacks, 
				* needed to wait until the custom chrome tab is closed
        */
        ExternalUrlHelper.registerForActivityResult(this)
    }
}

Now show the Payment Widget

Modal (DialogFragment)Kotlin
deunaSDK.initPaymentWidget(
    orderToken = "<DEUNA_ORDER_TOKEN>",
    callbacks = PaymentWidgetCallbacks().apply {
        onSuccess = { order ->
            // Close the DEUNA widget
            this.deunaSDK.close {
                // Handle successful payment:
                // - Navigate to confirmation screen
                // - Show success message
                // - Update order status
            }
        }
        onError = { error ->
            if (error.type == PaymentErrorType.PAYMENT_ERROR) {
                // Handle payment errors:
                // - Show error message
                // - Allow retry
                // - Log analytics
            }
        }
    },
    paymentMethods = listOf(
        mapOf(
            "paymentMethod" to "wallet",
            "processors" to listOf("mercadopago_wallet")
        )
    )
)
Jetpack ComposeKotlin
@Composable
fun YourScreen(
    deunaSDK: DeunaSDK,
    orderToken: String,
    userToken: String,
) {
    // Maintains the Deuna WebView instance across recompositions
    val deunaWidget = remember { mutableStateOf<DeunaWidget?>(null) }

    Column(modifier = Modifier.padding(16.dp)) {
        // Container for the embedded payment widget
        // MUST specify dimensions (e.g., .height(400.dp) or .weight(1f) in parent Column)
        Box(
            modifier = yourModifier
        ) {
            AndroidView(
                modifier = Modifier.fillMaxSize(),
                factory = { context ->
                    DeunaWidget(context).apply {
                        this.widgetConfiguration = PaymentWidgetConfiguration(
                            sdkInstance = deunaSDK,
                            orderToken = orderToken,
                            userToken = userToken,
                            paymentMethods = listOf(
                                mapOf(
                                    "paymentMethod" to "wallet",
                                    "processors" to listOf("mercadopago_wallet")
                                )
                            ),
                            callbacks = PaymentWidgetCallbacks().apply {
                                onSuccess = { data ->
                                    deunaWidget.value?.waitUntilExternalUrlIsClosed {
                                        // Handle post-payment flow
                                    }
                                }
                                onError = { error ->
                                    // Handle error
                                }
                            },
                        )

                        this.build() // Render the DEUNA widget
                        // Store reference for later submission
                        deunaWidget.value = this
                    }
                }
            )
        }

        Spacer(modifier = Modifier.height(16.dp))
    }

    // Critical: Clean up DeunaWidget resources when composable leaves composition
    DisposableEffect(Unit) {
        onDispose {
            deunaWidget.value?.destroy()
            Log.d("DeunaWidget", "WebView resources cleaned up")
        }
    }
}

Payment Widget - React Native#

JavaScript
import React from 'react';
import { View, Button } from 'react-native';
import { DeunaSDK, DeunaWidget } from '@deuna/react-native-sdk';

// Initialize SDK
const deunaSDK = DeunaSDK.initialize({
  publicApiKey: 'YOUR_PUBLIC_API_KEY',
  environment: 'sandbox', // or "production"
});

const PaymentScreen = () => {
  const launchPayment = () => {
    deunaSDK.initPaymentWidget({
      orderToken: 'YOUR_ORDER_TOKEN',
      paymentMethods: [
        {
          paymentMethod: 'wallet',
          processors: ['mercadopago_wallet'],
        },
      ],
      callbacks: {
        onSuccess: async (order) => {
          await deunaSDK.close();
          // Handle successful payment
          console.log('Payment successful:', order);
        },
        onError: async (error) => {
          // Handle payment errors
          console.error('Payment error:', error);

          if (...) {
            // Always await the close operation
            await deunaSDK.close();
            // Handle UI updates
            console.log('Payment widget closed due to error.');
          }
        },
      },
    });
  };

  return (
    <View style={{ flex: 1, justifyContent: 'center', alignItems: 'center' }}>
      <DeunaWidget instance={deunaSDK} />
      <Button title="Pay with Mercado Pago" onPress={launchPayment} />
    </View>
  );
};