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 - Payment Methods 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
    • Allow to Edit Payment method: to show/hide ability to edit their card expiry etc.
    • Allow to add a new Payment method: to add new Payment method for future use.
    • Allow to Select a Payment method: to ability to select an existing payment method as output variable of this component, which can be used on next step in the flow.
    • Make Payment Method selection required: to make the payment method selection required in case you also set up Allow to Select a Payment method to True.
      • Important: It is usefull when the next component in your flow is Lite Pae - Charge Customer, which expects Payment Method Id as input parameter (Stripe Payment Method Id) and this configuration set to true make it required to select a Payment Method Id on this component to move on to next step.
    • Required validation message for Payment Method selection: to customize validation message if both Allow to Select a Payment method and Make Payment Method selection required is set to true
• 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.