TrustPilot allows integration for automatic review invitations. The merchant sends order details to TrustPilot, and they send out email invitation.
More info:
And privacy policy:
Importato da support.iubenda.com (topic #42000005204) · 
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And you can also integrate a widget onto your site.
Hello,
Thank you for your messages and suggestion! We will look into adding TrustPilot's automatic review invitations and widgets to our generator.
In the meantime, I would suggest adding a custom clause by taking the following steps:
- visit your dashboard (https://www.iubenda.com/en/dashboard),
- visit your privacy policy,
- "Add service" and "Create custom service".
For more information, please see our help post: https://www.iubenda.com/en/help/386-how-to-add-a-custom-service-and-customize-to-your-needs .
Any further developments will be noted in this thread.
Kind regards,
Beatrice
iubenda