pos/pos_payment_terminal/views/pos_config.xml

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


    <record id="view_pos_config_form" model="ir.ui.view">
        <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="//field[@name='iface_cashdrawer']/.." position="after">
                <div class="row">
                    <label string="Payment Terminal" for="iface_payment_terminal" class="col-lg-3 o_light_label"/>
                    <field name="iface_payment_terminal"/>
                </div>
            </xpath>
        </field>
    </record>

</odoo>