Elle here from Shopify, hope you had a great week!
You will not have to pay this credit back to AdWords. The way the credit works is that you will need to spend a certain amount first in order to redeem the credit. We have a handy guide here that details this further if you wanted to check it out for clarification!
I hope this helps and feel free to reach out to our support if you have any other questions! We're available 24/7.
When the promo is activated you need to spend £25 in the first month to be eligible for the £75 credit.
So if you spend £100, you will only pay £25. I always recommend reading the fine print to avoid any accidental issues or expectations.
Terms and conditions for this offer: