3 to 7 days from they successful order you may want to ask them for a Google Review.

Hi {{FirstName}},

Thank you for your recent order with {{CompanyName}}.

We hope you're enjoying your purchase and that everything met your expectations. If you have a moment, we'd greatly appreciate it if you could leave us a Google review.

Your feedback helps us improve our products and services, and it also helps other customers make informed decisions.

Leave a review here:
[Insert Google Review Link]

If you've already left us a review, thank you for your support — we truly appreciate it.

Kind regards,

{{CompanyName}}
{{WebsiteLink}}

To setup Google Review links refer to 

Once you setup a Redirector link.

ie: https://yourdomainname.com/reviews

Add a link with this link