The company that uses the web api of Jasmin only provides services, so in downloading the invoice not only do not need to have the goods delivery data as these make it unaesthetic. The endpoint for downloading said invoice, according to the documentation, allows you to select the type of report you want. In this case we would like to obtain the invoice for services. According to the documentation the endpoint and parameters of the application address, it should be anything like:
/billing/invoices/Default/FA/2017/123/print?template=Billing.ServicesInvoiceReport
I tried in various ways like lowercase letters, bars, etc ... and I did not succeed with any, that is, it always comes with the delivery data.