I am having the same issue, Subscription renewals have not been sent to stripe. Have tried updating to 7.4, downgrading to 7.2, rolled the API keys. When I try test the keys / connection its ok, but when I manually renew a subscription nothing happens, and no record in the Strip Dashboard Developers Log showing any attempt at payment.
The chat representative wanted to investigate on my live site, and I said thats ok as long as there is no downtime. He gave me the link to post here……
Anyway, I have removed the plugin and my CPU seconds are under 200 now and I dont want to have my hosting restricted again, So I will continue without the plugin on my websites.