Adding a test to verify if `send_payment_request` is used once and only once, and under the right conditions. In the utils, we change the direct use of `opener` in portal_transaction for a softer use of `url_open` which manage the url and then call the `opener` for a same end result. task-2659750 closes odoo/odoo#84582 X-original-commit: c9371a2ec8dfbd7e55b1b6595e2a76d76ee36e12 Related: odoo/enterprise#24338 Signed-off-by: Antoine Vandevenne (anv) <anv@odoo.com> Signed-off-by: Morgane Demesmaeker <edm@odoo.com>