GooglePlay.js

<GooglePayButton
  environment="TEST"
  paymentRequest={{
    apiVersion: 2,
    apiVersionMinor: 0,
    allowedPaymentMethods: [
      {
        type: 'CARD', 
        parameters: {
          allowedAuthMethods: ['PAN_ONLY', 'CRYPTOGRAM_3DS'],
          allowedCardNetworks: ['MASTERCARD', 'VISA'],
        },
        tokenizationSpecification: {
          type: 'PAYMENT_GATEWAY',
          parameters: {
            gateway: 'example',
            gatewayMerchantId: 'exampleGatewayMerchantId',
          },
        },
},
    ],
    merchantInfo: {
      merchantId: '12345678901234567890',
      merchantName: 'Demo Merchant',
    },
    transactionInfo: {
      totalPriceStatus: 'FINAL',
      totalPriceLabel: 'Total',
      totalPrice: '100.00',
      currencyCode: 'USD',
      countryCode: 'US',
    },
  }}
  onLoadPaymentData={paymentRequest => {
    console.log('load payment data', paymentRequest);
  }}
/>