One of our service consists in selling used products on behalf of some of our customers. We do not buy nor sell the product itself but we can invoice for the service ( % of the selling price)

I created a service article with no sales price because it is variable for one case to the other.

At the time the customer requests our service, I need to send him/her a contract.

I have created a document template for this type of contract.

In a Saas online with Odoo, How to make this template available for an email with the attached contract?