This is the message I received from Stripe support. Does this make any sense to you and can this help you or does this even involve your plugin?
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Hi Jennifer,
Thank you for taking my call today. It was a pleasure talking to you. I just wanted to quickly touch base with you about the conversation we just had.
By looking into this further, I’m not seeing any plugin to connected to your Stripe account.
Meanwhile, I checked your dashboard logs and I can see 400x error code (invalid_request_error). This errors arise when your request has invalid parameters.
https://stripe.com/docs/api/errors#errors-invalid_request_error
With this being said, I would recommend for you to save the card details with a Customer. You can also attach the Payment Method to that object if there’s already an existing customer object. Below is additional info on that:
https://stripe.com/docs/api/customers.
https://stripe.com/docs/payments/save-after-payment#web-create-payment-intent
Thanks again for reaching out. If you run into issues still, just reply directly to this email and I will gladly do all that I can. I am here for you.
All the best,
Inee