Been doing this for years, usually use it to rent movies lol. I'll definitely be subbing to Google One for 3 months on the top tier, it's less than £2 a month for the first 3 months then I'll downgrade to the lowest paid tier I think. Should definitely have the credit by then!For that, I use the Google Opinon Rewards app. By completing survey tasks you can earn Google Playstore credit. I've bought so many free Google apps with this over the years! Or you can build up the credit & buy a YouTube subscription.