you can use the ir.config_parameter model. Here's an example of how you can retrieve the Avatax configuration values:

avatax_account_number = self.env['ir.config_parameter'].sudo().get_param('account.avatax_account_number') avatax_license_key = self.env['ir.config_parameter'].sudo().get_param('account.avatax_license_key') 

# Fetch other Avatax configuration fields as needed

# Process the retrieved values as required

In the above code, account.avatax_account_number and account.avatax_license_key are the parameter keys for the Avatax configuration fields.

Make sure to import the ir.config_parameter model in your Python file:

from odoo import models, fields, api

Note: The specific parameter keys may vary depending on the module or customization you have installed for Avatax integration in Odoo. You can refer to the Avatax module's code or documentation to find the exact parameter keys for the configuration fields you need.

If self.env['res.config.settings'] is returning False, it means that there is no active configuration settings record available. In that case, you can directly fetch the configuration values from the ir.config_parameter model as shown above.