Add checkbox to send Trustpilot Review invitations (GDPR)

Hey Guys,

I’m running my online shop in Germany using WooCommerce and collect reviews via Trustpilot.
As I need to comply with the GDPR, I’m currently asking my customers in the purchase-confirmation-e-mail, whether they would be ok rating me there.
For those people who agree, I change the order to “completed” so the Trustpilot plugin sends out the review invitation automatically. People who don’t agree, I just leave “in progress” because this doesn’t trigger the Trustpilot E-Mail.

The thing is that I’m currently hiring my first employee, and it’s impossible to keep the overview of which orders were shipped and which weren’t this way (I’m currently at 175 open orders that were actually shipped a long time ago, because these people didn’t agree on rating me.

So, my question is: Is there a way to add a checkbox that needs to be ticked in order to make the Trustpilot Plugin send out an E-Mail when I set the order status to “completed”?

I didn’t find any plugin or function in the plugin, so I assume the only way would be to write some individual code. As I don’t have any idea about coding, I hope for your help here.
In case there is a similar rating plugin that has this function, I’d also consider to change.

Thank you so much in advance!
Best wishes
Lukas

The page I need help with: [log in to see the link]