Here is an example of how you could create a link to a generated PDF in Odoo for a sales order:

Create a new report action for the sales order:

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from odoo import api, models

class SalesOrderReport(models.AbstractModel):

    _name = 'report.sales_order_report'

    @api.model

    def render_html(self, docids, data=None):

        # Get the sales order record

        order = self.env['sale.order'].browse(docids[0])

        # Generate the PDF report

        pdf_report = self.env.ref('module_name.report_name').render_qweb_pdf([order.id])[0]

        # Attach the generated PDF report to the sales order record

        order.write({'pdf_report': pdf_report})

        # Return the HTML for the report

        return self.env['report'].render('module_name.report_name', {'order': order})

Add a new field to the sales order model to store the PDF report:

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pdf_report = fields.Binary('PDF Report')

Create a new button in the sales order form view to generate the PDF report and open it in a new window:

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Add an action to the button to call the report action and open the generated PDF:

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@api.multi

def generate_pdf(self):

    return self.env.ref('module_name.report_name').report_action(self)

Add the pdf_report field to the view :

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This is just a basic example to illustrate the process of creating a link to a generated PDF in Odoo for a sales order. You may need to adjust the code to suit the specific requirements of your implementation.

There are two sides to this:

1) access_token is in base model, so it does exist for all models AFAIK.

2) To have same functionality as in sales & invoice, you need to write a controller that will handle external user access. Check the code in sales controller for " /my/orders/" to be able to do the same for your report.