This is happening to me too. As a result, my site is unable to process any payments, and I’m getting failed order messages. This seems to have started happening since last WordPress update that I received on the weekend. I updated Stripe Plugin (4.0.3) in the hope that this would fix the problem, and it hasn’t. Urgent fix needed. Problem seems to have derived from later WordPress update
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This reply was modified 6 years, 10 months ago by Sandra-77.