// Check if Google Pay is available 
const paymentsClient = new google.payments.api.PaymentsClient({ 
environment: 'PRODUCTION' // or 'TEST' 
}); 
// Define supported payment methods 
const allowedPaymentMethods = [{ 
type: 'CARD', 
parameters: { 
allowedAuthMethods: ['PAN_ONLY', 'CRYPTOGRAM_3DS'], 
allowedCardNetworks: ['VISA', 'MASTERCARD', 'AMEX', 
'DISCOVER'] 
}, 
tokenizationSpecification: { 
type: 'PAYMENT_GATEWAY', 
parameters: { 
 gateway: 'coastalpay', 
            gatewayMerchantId: 'YOUR_MERCHANT_ID' 
        } 
    } 
}]; 
 
// Create payment data request 
const paymentDataRequest = { 
    apiVersion: 2, 
    apiVersionMinor: 0, 
    allowedPaymentMethods: allowedPaymentMethods, 
    merchantInfo: { 
        merchantId: 'YOUR_GOOGLE_MERCHANT_ID', 
        merchantName: 'Your Store Name' 
    }, 
    transactionInfo: { 
        totalPriceStatus: 'FINAL', 
        totalPrice: '99.99', 
        currencyCode: 'USD', 
        countryCode: 'US' 
    } 
}; 
 
// Check if Google Pay can make payments 
paymentsClient.isReadyToPay({ 
    apiVersion: 2, 
    apiVersionMinor: 0, 
    allowedPaymentMethods: allowedPaymentMethods 
}).then(response => { 
    if (response.result) { 
        // Show Google Pay button 
        addGooglePayButton(); 
    } 
}); 
 
// Handle payment request 
function onGooglePayButtonClicked() { 
paymentsClient.loadPaymentData(paymentDataRequest) 
.then(paymentData => { 
// Process payment token 
processPayment(paymentData); 
}) 
.catch(err => { 
console.error('Payment failed:', err); 
}); 
} 
// Process payment token with backend 
function processPayment(paymentData) { 
const paymentToken = 
paymentData.paymentMethodData.tokenizationData.token; 
fetch('/process-google-pay', { 
method: 'POST', 
headers: { 'Content-Type': 'application/json' }, 
body: JSON.stringify({ token: paymentToken }) 
}) 
.then(response => response.json()) 
.then(result => { 
if (result.success) { 
window.location.href = '/confirmation'; 
} 
}); 
}