Thats the DataLayer:

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{% if first_time_accessed %}<script>                              

    window.dataLayer = window.dataLayer || [];                                            

    var shipping_price = '{{shipping_price | money_without_currency }}';

    shipping_price  = shipping_price.replace(",", ".");

    var total_price = '{{total_price | money_without_currency }}';

    total_price  = total_price.replace(",", ".");

    var tax_price = '{{tax_price | money_without_currency }}';

    tax_price  = tax_price.replace(",", ".");

    window.dataLayer.push({

    'page_type': 'purchase',

    'event': 'purchase',

    'currency': "{{ shop.currency }}",

    'totalValue': total_price,

    'shipping': shipping_price,

    'tax': tax_price,

    'payment_type': '{{order.transactions[0].gateway}}',

    'transaction_id': "{{order.name}}",

    });</script>

    {% endif %}

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