suite/pos_pax/views/pos_config_setting_views.xml

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

    <record id="pos_config_view_form_inherit_pos_pax" model="ir.ui.view">
        <field name="name">pos.config.form.inherit.pax</field>
        <field name="model">pos.config</field>
        <field name="inherit_id" ref="point_of_sale.pos_config_view_form"/>
        <field name="arch" type="xml">
            <xpath expr="//div[@id='payment_methods_new']" position="after">
                <div class="col-12 col-lg-6 o_setting_box" id="pos_pax">
                    <div class="o_setting_right_pane">
                        <strong class="o_form_label">PAX</strong>
                        <div>
                            <p>Your PAX Device Endpoint</p>
                            <field name="pax_endpoint"/>
                        </div>
                    </div>
                </div>
            </xpath>
        </field>
    </record>
    
</odoo>