flectra/addons/payment_paypal/views/payment_paypal_templates.xml

<?xml version="1.0" encoding="utf-8"?>
<flectra>
    <data noupdate="1">
        <template id="paypal_form">
            <div>
                <input type="hidden" name="data_set" t-att-data-action-url="tx_url" data-remove-me=""/>
                <input type="hidden" name="cmd" t-att-value="cmd"/>
                <input type="hidden" name="business" t-att-value="business"/>
                <input type="hidden" name="item_name" t-att-value="item_name"/>
                <input type="hidden" name="item_number" t-att-value="item_number"/>
                <input type="hidden" name="amount" t-att-value="amount"/>
                <input t-if="handling" type="hidden" name="handling"
                    t-att-value="handling"/>
                <input type="hidden" name="currency_code" t-att-value="currency_code"/>
                <!-- partner / address data -->
                <input type="hidden" name="address1" t-att-value="address1"/>
                <input type="hidden" name="city" t-att-value="city"/>
                <input type="hidden" name="country" t-att-value="country"/>
                <input type="hidden" name="email" t-att-value="email"/>
                <input type="hidden" name="first_name" t-att-value="first_name"/>
                <input type="hidden" name="last_name" t-att-value="last_name"/>
                <input type="hidden" name="zip" t-att-value="zip_code"/>
                <input t-if='state' type='hidden' name="state"
                    t-att-value='state'/>
                <!-- after payment parameters -->
                <input t-if='custom' type='hidden' name="custom"
                    t-att-value='custom'/>
                <!-- URLs -->
                <input t-if="paypal_return" type='hidden' name='return'
                    t-att-value="paypal_return"/>
                <input t-if="acquirer.paypal_use_ipn" type='hidden' name='notify_url'
                    t-att-value="notify_url"/>
                <input t-if="cancel_return" type="hidden" name="cancel_return"
                    t-att-value="cancel_return"/>
            </div>
        </template>
    </data>
</flectra>