bank-statement-import/account_bank_statement_import_online_paypal/views/online_bank_statement_provider.xml

<?xml version="1.0" encoding="utf-8"?>
<!--
    Copyright 2019 Brainbean Apps (https://brainbeanapps.com)
    License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl).
-->
<odoo>

    <record model="ir.ui.view" id="online_bank_statement_provider_form">
        <field name="name">online.bank.statement.provider.form</field>
        <field name="model">online.bank.statement.provider</field>
        <field name="inherit_id" ref="account_bank_statement_import_online.online_bank_statement_provider_form"/>
        <field name="arch" type="xml">
            <xpath expr="//page[@name='configuration']" position="inside">
                <group attrs="{'invisible': [('service', '!=', 'paypal')]}">
                    <group>
                        <field
                            name="api_base"
                            string="API base"
                            groups="base.group_no_one"
                        />
                        <field
                            name="username"
                            string="Client ID"
                            password="True"
                            attrs="{'required': [('service', '=', 'paypal')]}"
                        />
                        <field
                            name="password"
                            string="Secret"
                            password="True"
                            attrs="{'required': [('service', '=', 'paypal')]}"
                        />
                    </group>
                </group>
            </xpath>
        </field>
    </record>

</odoo>