There are multiple subscription options for the RepTime Portal, the features of which are described HERE.
When using the Basic Free Version, you are limited to uploading a maximum of 1,000 items, and accessing the last 4 digits of any credit cards that may be attached to orders you receive.
To unlock these (and additional) features, you'll need to upgrade your version.
This can be done via the Upgrade my Subscription button on the Dashboard.
The resulting popup will allow you to view the different subscription levels and what they offer, as well as download the paperwork required to upgrade your account should you choose to do so!