Maybe this will be helpful for others... I was instructed by FF support team to follow the instructions on the article: https://formidableforms.com/knowledgebase/stripe/#kb-update-credit-card-details Stripe offers a 'customer portal' that you can set up on their platform that allows users to update their payment methods and can have your branding on it. You will get a custom link from Stripe and you integrate that on your website.
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I can't help, but someone with API experience would need to help with something like this -> https://stripe.com/docs/api/subscriptions/object