<?xml version="1.0" encoding="UTF-8" ?>
<odoo>

    <template id="checkout" inherit_id="payment.checkout">
        <xpath expr="." position="inside">
            <script defer="1" type="text/javascript" id="sig-api" t-att-data-order-session-id="request.session.session_token"
                    src="https://cdn-scripts.signifyd.com/api/script-tag.js"></script>
        </xpath>
    </template>

</odoo>