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Im not sure, but yesterday i read this post in the french prestashop forum:

https://help.202-ecommerce.com/stripe-for-prestashop/procedure-to-replace-the-stripe-key-in-the-database/

maybe that is your problem?

I have a payment today via stripe that worked.

The only thing i have done is update from 2.3.4 to 2.3.5, and i think its important to click "save".