1. Define a view of the kanban type:

<record id="view_all_customers_kanban" model="ir.ui.view"> 
    <field name="model">res.partner</field> 
    <field name="arch" type="xml"> 
        <kanban> 

2. List the fields you'll use in your view:

    <field name="name" /> 
    <field name="supplier" /> 
    <field name="customer" />

3. Implement a design:

   <templates> 
       <t t-name="kanban-box"> 
           <div class="oe_kanban_card"> 
                <a type="open"> 
                    <field name="name" /> 
                </a> 
                    <t t-if="record.supplier.raw_value or 
                             record.customer.raw_value">
                       is
                       <t t-if="record.customer.raw_value">
                           a customer
                       </t>
                       <t t-if="record.customer.raw_value and 
                                record.supplier.raw_value">
                           and
                       </t>
                       <t t-if="record.supplier.raw_value">
                            a supplier
                       </t>
                    </t> 
               </div> 
            </t> 
     </templates> 

4. Close all the tags:

        </kanban> 
    </field> 
</record> 

5. Add this view to one of your actions. This is left as an exercise for the reader. You will find a full working example in the GitHub example files: https://github.com/PacktPublishing/Odoo-12-Development-Cookbook-Third-Edition.