cooperative-market/beesdoo_website_posorder_amount/templates/portal_posorder_amount.xml

<?xml version="1.0" encoding="utf-8"?>
<!--
     Copyright 2018 Rémy Taymans <remytaymans@gmail.com>
     License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).
-->
<odoo>

    <!-- Add pos.order total amount -->
    <template
            id="total_pos_order_amount"
            name="Portal total POS order amount"
            priority="40"
            inherit_id="portal.portal_layout">
        <xpath expr="//div[hasclass('o_portal_my_details')]" position="after">
            <div class="o_my_details_eater mt-2">
                <h4 class="page-header">Purchases</h4>
                <hr class="mt-1 mb-0"/>
                <p>
                    You have purchased a total amount of
                    <span t-esc="posorder_amount"
                          t-esc-options='{"widget": "monetary", "display_currency": "company_currency"}'/>
                    .
                </p>
            </div>
        </xpath>
    </template>

</odoo>