1) You can copy across all customer card details, or upload a csv file containing a list of the specific customer billing id's you wish to move.
2) If moving specific customers, collate a list of the billing id's into a sheet (.csv) with no headings, just one column of the Id's.
3) You can then upload these to copy from the original account to the new account. Navigate to the customers tab and hit 'Copy', then 'upload file'. If moving all card details, you can select 'Copy all customers' instead.
4) Enter the Account ID of the Stripe account you wish to move the details to.
5) You'll then have to approve the copy in the new account - there will be an action to approve when you log in to that Stripe account.
6) Let us know once that is completed and we'll link the card details to the customer contact details in your Stora account. (This is linking the details to the customer contact import you have provided.) After that you'll be able to create subscriptions in your Stora account using the card details.
The Stripe support articles on this process can be found here.