For your online store to be able to accept card payments, you will need an account with one of our supported payment providers and need to configure that payment provider for that store. Configuration is done by creating a Payment Provider record for that store in Salesforce. A help article exists for each supported provider.
Payment Provider is a related record to the Store record and can be found in the store's related list as well as in the StoreConnect Navigator. A store can offer a customer more than one payment option so add as many as you need. Full card details are not collected or stored by StoreConnect. The customer fills out a payment form on your checkout that is provided by your payment service provider. StoreConnect does however have access to the last four digits of the card, the expiry date, and the card type (VISA, Mastercard, AMEX, etc.).