Below the example is the "Cross-Sell" option to pay for the creation and delivery of a physical membership card.

1. Setup Product For Additional Fee (eg $5 Annual, GBP2 One-Off)

Note: This can be a recurring or one-off fee

2. Assign "Cross-Sell" Item to a Product.

Open the existing product for membership, and select a Cross-sell product from the dropdown

3. Test in Frontcover

Test and view the checkout to ensure the item appears, and the label and optional image appear correctly.

Get more info on Stripe Cross-Sell is below:

https://docs.stripe.com/payments/checkout/cross-sells?payment-ui=embedded-form