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How to put the value of the shopping cart purchase into value in the below code

New Community Member

How to put the value of the shopping cart purchase into value in the below code

I am using session variable for value.

 

<script>

paypal.Buttons({
createOrder: function(data, actions) {
return actions.order.create({
purchase_units: [{
amount:
{
value: '0.01'
//cartTotal = cartTotal.toString();
//value: 'cartTotal'
}
}]
});
},
onApprove: function(data, actions) {
return actions.order.capture().then(function(details) {
alert('Transaction completed by ' + details.payer.name.given_name);
// Call your server to save the transaction
return fetch('/paypal-transaction-complete', {
method: 'post',
headers: {
'content-type': 'application/json'
},
body: JSON.stringify({
orderID: data.orderID
})
});
});
}
}).render('#paypal-button-container');
</script>