With Payment Methods component, you can allow your customers to add/edit their Credit Cards in stripe based on their customer id. Basically you will have your customer's id map to salesforce using Lite Pae - Customer Profile component and then use that to setup payment methods for that customer.

• Create a new flow.
• Add a step to query Payment Account and store its Id in a flow variable i.e. paymentRecordId.
• Add a step to query Stripe Customer Id and store its value in a flow variable i.e. stripeCustomerId.
• Add a screen component and add Lite Pae - Customer Profile component on it.
• Configure its properties like
  • Payment account record Id to above flow variable (paymentRecordId)
  • Stripe Customer Id to above flow variable i.e. (stripeCustomerId).
  • Optionally, you can setup some other properties like to show/hide ability to edit their card expiry etc.
• Save and activate the flow.
• Add flow on your Salesforce Lightning or Experience Cloud page and you are good to collect payment methods.
• Checkout the following package for a sample flow for above scenario.