We operate an e-commerce site running on WordPress with WooCommerce.
We use the Stripe for WooCommerce Gateway to process credit card payments, and we are using version 1.2.1. We've modified this version so that our users can save their credit cards for future use (all credit card information is stored by Stripe -- the plugin just calls it from the Stripe server/database.
We need to upgrade to the new version of the Stripe plugin (1.5, I believe). This is very easy. The problem is that, once we upgrade, saved credit cards are no longer associated with their users when we upgrade. So if I have made a purchase and saved my credit card, when we upgrade to 1.5, I need to re-enter my credit card. We need to upgrade without that happening, which I assume will involve simple modifications to the new Stripe plugin