Google Merchant Reviews Opt-in Integration

Hi, I have spent a lot time in integrating Google Merchant Reviews Opt-in in my store.
Tried out custom pixel method as the addition scripts on is depreciated, but custom pixel method does not work as well.
So, I did some research and found this app
https://apps.shopify.com/easy-google-customer-reviews
Can anyone tell if this app will be helpful in my cause or not?

So, I have installed it and currently using there free trial.
But currently it didn’t show up the Merchant Reviews opt-in on the Order status page.
But if i navigate to other pages of my store, then i can see the rating badge.

Thanks.
I was missing this step.
https://egcr.zendesk.com/hc/en-gb/articles/21542152092818-Enabling-the-survey-on-your-store-Checkout-Extensibility
And now it works.